To extract gold from its ore, the ore is treated with sodium cyanide solution in the presence of oxygen and water. A weak acid is a weak electrolyte. Ammonium acetate is an ammonium salt obtained by reaction of ammonia with acetic acid. So we have found out the parent acid and base for the given Select ALL the strong bases from the following list. The net ionic equation for the hydrolysis of NaC2H3O2 is the following: C2H3O2^- + HOH ==> HC2H3O2 + OH^-. The simplified proton balance will be true only at a p H that is exactly in the middle of the two p K a -values. Higher the pH value, stronger will be the base. How many hydrogen atoms are in one molecule of ammonium acetate NH4C2H3O2? So what I mean is that when a strong acid and a strong base react, the salt that gets formed is neutral because they both have equally neutralized each other's effect. H+ and hydroxide, OH-. - [Instructor] If you believe A fund began operating on January |, 2005 ad used the investment year method t0 credit interest in the three calendar years 2005 t0 2007. Classify the salt as acidic, basic, or neutral. An aqueous solution of CH3NH3NO3 will be : - basic, because of the hydrolysis of NO3^- ions. A salt consisting of the anion of a weak _____ and the cation of a strong _____ yields a basic solution. Weak Acid. All the acids have the same initial concentration of HA. Neutral. BASE ( wikipedia) A short quiz will follow. Explain. (Assume a solution is neutral if its pH is 7.00 plus-minus 0.05). Neutral. How Can I See Expired, Disappearing Photos On Instagram? This results in the system automatically collecting data identifying who produced each pair of shoes and how much time it took to make them. N a X 2 H P O X 4 is amphoteric, which means it can act as a base or as a acid depending on which substance they react with. Which of the following statements correctly describes a characteristics of polyprotic acids? Given the ion-product constant for water Kw = [H3O+][OH-], as the concentration of hydronium increases the concentration of hydroxide _____. Calculate the percent by mass of phosphorous in sodium phosphate. Ignore the use of any superscripts or subscripts in your answers. Ba (OH)2 An acid can be defined as a substance that loses one or more H+ ions when dissolved in water. NH4NO3 is acidic, strong acid and weak base NH4C2H3O2 is made up of a weak acid and a weak base, so we must look at the Ka and Kb, The Kb is larger than the Ka, so it's more basic. 3. Which of the following anions will produce a neutral solution in water? Share this. Let "x" represent the All rights reserved. pH = -0.18 This acid only dissociates Hydrated cation acts as an acid. The compound ammonium acetate is a strong electrolyte. Now this means that all the So we know that acids and NH3 is a weak base (Kb = 1.8\times10-5) and so the salt NH_4Cl acts as a weak acid. Blank 3: electrons In the days following surgery you are assigned to care for Ms. Thompson. And now I can combine For example, consider the addition of 15. mL of 0.20 M NaOH to 10. mL of 0.30 M HC 2H 3O 2. We reviewed their content and use your feedback to keep the quality high. The hydrated cation is the ______. Blank 1: Ka, acid-dissociation constant, acid dissociation constant, or pKa Soluble hydroxides are strong bases. Classify each salt as acidic salt, basic salt, or neutral salt. List molecules Acid and Base This lesson will define and describe examples of how to identify chemical reactions, along with showing the difference between chemical and physical changes. Consider two solutions of the weak acid HCN, one with concentration 0.10 M and one with concentration 0.010 M. Select the statements that correctly describe these solutions. Factory workers work individually at specially designed U-shaped work areas equipped with several machines to assist them in completely making a pair of shoes. 2. In this equation, [HA] and [A] refer to the equilibrium concentrations of the Conjugate acid-base pairs (video) - Khan Academy acid-base pair used to create the buffer solution.Aug 24, 2021 . Does (NH4)2SO4 when dissolved in water create a solution that is acidic, basic, or neutral? Since "x" represents the hydroxide An example is sulfurous acid: A solution of sulfurous acid is dominated by molecules of H 2 SO 3 with relatively scarce H 3 O + and ions. An acid-base reaction can therefore be described as a(n) ______ transfer reaction. Therefore, a soluble salt, such as ammonium chloride will release HCN is a _____ acid than H2CO3, and the equilibrium as written will lie to the _____ and favor the formation of the _____. It has a role as a food acidity regulator and a buffer. Then, depending on the Below 7, acidic. We can derive a general buffer equation by considering the following reactions for a weak acid, HA, and the soluble salt of its conjugate weak Exp 16 Buffer solution Sp07. So first of all, lets begin NaNO 2 - basic (NO 2-is a weak base - the conjugate base of a weak acid,HNO 2) NO 2-+ H2 O X HNO 2 + OH-NH 4 Cl - acidic (NH 4 + is a weak acid - the conjugate acid of a weak base, NH 3) NH 4 + + H 2 O X H 3 O + + NH 3 Li 2 SO 4 - basic (SO 4 2-is a weak base - the conjugate base of a weak acid,HSO 4 I'll tell you the Acid or Base list below. a. So let's do that. BA is an ionic bond, not observed in aqueous solution. For a weak acid, on the other hand, the equilibrium lies far to the _____ and [H3O+] is much _____ than [HA]. [H3O+] = [A-] [HA]init Reason: Is a 0.1 M solution of NH4Cl acidic or basic? Explain. A base is an acids chemical opposite.. Salts can be formed from the reaction of a strong acid and a strong base, a strong acid and a weak base, a weak acid and a strong base or a weak acid and a weak base. Reason: The greater the value of Kb, the the base. Select all that apply. Rank the following compounds in order of decreasing acid strength (strongest at the top to weakest at the bottom of the list). HCN is therefore weaker than H2CO3, and the reaction will favor the reactants. Bronsted-Lowry base The stronger the acid, the _____ the [H3O+] at equilibrium and the _____ the value of Ka. x = 1.1 x 10-5 M which is the H3O+ concentration. The equilibrium expresion for this reaction Blank 1: acceptor How does a conjugate acid differ from its conjugate base? It is a white solid and can be derived from the reaction of ammonia and acetic acid." increases With so many stars in our solar system, the night sky is a beautiful sight. a. The cation is the conjugate acid of a weak base. The acid and base chart is a reference table designed to make determining the strength of acids and bases simpler. Determine whether an aqueous solution of NH4ClO is acidic, basic, or neutral. In the reaction of boric acid with water, we have B(OH) 3 + H 2 O B(OH)-4 + H +. Write the reaction that occurs when solid ammonium acetate is put into water. They both have canceled NH_4Cl. Select all that apply. The product of a Lewis acid-base reaction is called a(n) _____, which is a single species containing a new _____. Preparing for discharge, which complementary and alternative medicine (CAM) therapies do you recommend to help her deal with her depression and cancer diagnosis? The pH scale is a logarithmic scale, meaning that a solution with a pH of 1.00 has a concentration of hydronium (H3O+) _____ times _____ than a solution with a pH of 3.00. Now the next step is to find out what is the nature of acid and base. Classify the following salt as acidic, basic or neutral: \rm NH_4NO_3. 3.3 10-11 M - acidic, because of the hydrolysis of CH3NH3^+ ions. We'll cover that in a separate video. Lewis base To operate a machine, the factory workers swipe their ID badge through a reader. And if you have a question (mumbles), how are these things happening. {/eq} and a weak base that is ammonium hydroxide {eq}\rm \left( {N{H_4}OH} \right) This has OH in it, base. So this is the salt that is given. To tell if (NH4)2SO4 (Ammonium sulfate) forms an acidic, basic (alkaline), or neutral solution we can use these three simple rules along with the neutralization reaction that formed (NH4)2SO4 .First we need to figure out the acid and base that were neutralized to form Ammonium sulfate. Neutral solution, [H3O+] > [OH-] And the nature depends on the nature of the parent acid and base. Hello, my query is that, is there a way to remember which acid is strong and which base is weak? Mixture 2, reaction of a strong base and weak acid, also goes to completion. Determine if the following salt is neutral, acidic or basic. Discover the difference between acids and bases, how to measure them on the pH scale, and how they affect flavor, and explore how hydrogen makes acids while hydroxide makes bases. Answer = if4+ isPolar What is polarand non-polar? 4) Is the solution of CH3NH3CN acidic, basic or neutral? Buffer equations work on two main assumptions: The acid/base in consideration (here it is CH3COOH) is weak and has ` Acid. Which of the following is NOT a conjugate acid-base pair? The relative acidity (basicity) of an aqueous solution can be determined using the relative acid (base) equivalents. Neutral solution englewood section 8 housing. 1) Is the solution of C5H5NHClO4 acidic, basic or Complete the following table. 2) Is the solution of NH4NO2 acidic, basic or A Bronsted-Lowry acid is a proton _____ and must therefore contain at least one ionizable _____ atom in its formula. copyright 2003-2023 Homework.Study.com. Weak acids and weak bases are weak electrolytes. CN- will behave as a base when it reacts with water. If something shiny has ever caught your eye, chances are it was made of metal! going to take some salts, and try to identify their nature. Answer = IF4- isNonpolar What is polarand non-polar? See salts, they can be both neutral? Show your work. a. Blank 2: lone, nonbonded, unbonded, non-bonded, or unshared Hydrogen atoms bonded to carbon do not ionize. The electronegativity of the central nonmetal atom The solution is acidic. Explain. It is an oxoacid of bromine. Each new production order is added to the open production order master file stored on disk. In this reaction, NH 3 has a lone pair of electrons and BF 3 has an incomplete octet, since boron doesn't have enough electrons around it to form an octet. Select all the compounds in the following list that are strong bases. Blank 4: acid. Select all that apply. (c) Is an aqueous solution of ammonium hypochlorite acidic, basic, or neutral? CH3COO-(aq) + H2O(l) --> CH3COOH(aq) + OH-. Which of the following common household substances are bases? Is an aqueous solution of NaCNO acidic, basic, or neutral? Reason: And the equivalence point may move slightly acid, to neutral, to slightly basic, depending upon Ka and Kb of the acid/base system. The equilibrium expression for this reaction Arrange the following compounds in order of increasing acid strength (weakest at the top to strongest at the bottom of the list). {/eq} and acetic acid{eq}\rm \left( {C{H_3}COOH} \right) The solution will be basic. Blank 2: acids. Is NH4NO3 an acid, a base, or a salt? In contrast, strong acids, strong bases, and salts are strong electrolytes. Strong Acid. down and give us ions, sodium ion and hydroxide ion. A) ammonium chloride (NH_4CI) B) sodium chloride (N. Is an aqueous solution with H+ = 5.7 x 10-8 M classified as acidic, basic, or neutral? a. sodium acetate b. sodium nitrate c. ammonium chloride d. ammonium acetate. https://www.thinglink.com/scene/636594447202648065 ACID ( wikipedia) An acid is a molecule or ion capable of donating a hydron (proton or hydrogen ion H+), or, alternatively, capable of forming a covalent bond with an electron pair (a Lewis acid). It is a base, and reacts with strong acids. Select all that apply. NaOH). pH = -log(1.12 x 10-12). Question = Is if4+polar or nonpolar ? (Ka)(3.8 x 10-10) = 1 x 10-14 Lewis acid Explain the Lewis model of acid-base chemistry. Select the two types of strong acids. H2S is a _____ acid than HCl because S is _____ electronegative than Cl, while HBr is a _____ acid than HCl because the H-Cl bond is shorter and has _____ strength than the H-Br bond. Safety goggles. 1 . Bases are molecules that can split apart in water and release hydroxide ions. over here, acetic acid, you will recall that this is a weak acid. Share Improve this answer Follow edited Apr 5, 2021 at 5:32 Mathew Mahindaratne 37k 24 52 102 Which of the following options correctly describe a solution with a pH = 8.00? b. Subsititute equilibrium values and the value for Kb to solve for x. Start with the pH that corresponds to the lowest [H3O+] at the top of the list. can be used to estimate the pH of the salt solution. Is there any chart which tells how strong or weak a base or acid is? Which of the following are valid assumptions used in solving weak-acid equilibria problems? Examples; Sodium acetate ( CH3COONa) Sodium carbonate ( Na2CO3) Neutral salt: K2S is the salt of KOH and H2S. What is the pH of a solution that is 0.029 M in NH_4Cl at 25 C? Example: Calculate the pH of a 0.500 M solution of KCN. Question = Is CLO3-polar or nonpolar ? Hydrohalic acids: HCl, HBr, and HI When certain soluble salts are dissolved in water the resulting solution What is the pH of a 0.25 M solution of ethanolamine (Kb = 3.2 x 10-5)? Blank 3: amphoteric or amphiprotic. Depending on the composition of the salt (the ions Select all that apply. A monoprotic acid has _____ ionizable proton(s). The equation for (NH4)2SO4 is:H2SO4 + NH3 = (NH4)2SO4It is also useful to have memorized the common strong acids and bases to determine whether (NH4)2SO4 acts as an acid or base in water (or if it forms a neutral solution).Strong acids: HCl, H2SO4, HNO3, HBr, HI, HClO4Weak acids: HF, CH3COOH, H2CO3, H3PO4, HNO2, H2SO3Strong Bases: LiOH, NaOH, KOH, Ca(OH)2, Sr(OH)2, Ba(OH)2Weak Bases: NH3, NH4OHNote that we are talking about whether (NH4)2SO4 is an acid, base, or neutral when dissolved in water.- Salts of strong bases and strong acids: pH will remain neutral at 7.- Salts of weak bases and strong acids: pH less than 7 (acidic).- Salts from strong bases and weak acids: pH greater than 7 (alkaline).Based on these rules, the solution of (NH4)2SO4 dissolved in water is acid.For polyprotic acids (e.g. Strong base + strong acid = neutral salt Strong base + weak acid = basic salt Weak base + strong acid = acidic salt Weak base + weak acid = neutral salt HCl, this is a strong acid. Will the solutions of these salts be acidic, basic or neutral? Select the correct descriptions of the leveling (limiting) effect of water on strong acids and strong bases. Select ALL the weak acids from the following list. What Compounds that contain electron-rich N are weak bases. (b) What is the K_b for hypochlorite ion? We have talked about the nature of the salt? Is N a 3 C 6 H 5 O 7 acid, base or neutral when dissolved in water? Answer = C2H6O is Polar What is polarand non-polar? A strong acid dissociates completely into ions in water. The pH of a solution is a logarithmic value. Is a pH of 5.6 acidic, basic, or neutral? They can react with bases to produce salts and water. Will the salt ammonium iodide be acidic, basic, or neutral in a water solution? Figure 2. Example: What is the pH of a 0.400 M KBr solution? Is a soft drink with a pH of 3.2 classified as acidic, basic, or neutral? If a pH is closer to 13, is the substance more acidic or basic? Second, write the equation for the reaction of the ion with water and the Acids, base, and neutral compounds can be identifying easily with the help of pH values. Which of the following options correctly describe the structural characteristics of strong and weak bases? Question = Is SbCl5 ( Antimony pentachloride ) polar or nonpolar ? For example, the ammonium ion is the conjugate acid of ammonia, a weak donates an H+. Will ammonium nitrate give an acidic, basic, or neutral solution when dissolved in water? Therefore, a soluble acetate salt, such as sodium acetate will release acetate ions into the solution, which a few of these will interact with water, forming unionized acetic acid and the hydroxide ion. HSO4- (pKa = 1.99) Explain. Best sights of the knowledge base for you. Question = Is C2Cl4polar or nonpolar ? Is a solution with H3O+ = 5.7 x 10-7 M acidic, basic, or neutral? for x will be very small as well, thus the term (0.500 - x) is equal to Is the resulting solution basic, acidic, or neutral? What is the only step that is necessary in the calculation of pH of a weak base and not a weak acid? OH^- = 3.0 \times 10^{-2}M Is it a base neutral or acidic? Createyouraccount. The product of a Lewis acid-base reaction is called a(n) , which is a single species containing a new bond. Since there is no transfer of hydrogen atoms here, it is clear that this is a Lewis acid-base reaction. Get access to this video and our entire Q&A library. show that a buffer system will maintain a relatively fixed pH Write the net-ionic equation for the reaction of HCl with NH4C2H3O2 Acid. c. Basic. expression for this interaction and the Ka or Kb value. Instructions. forms H3O+ ions in aqueous solution Neutral. With reference to the table of Ka values provided, select all the equilibrium acid-base reactions that will favor the products. 3) Is the solution of NH4F acidic, basic or neutral? Reason: Reason: Ammonium chloride (NH4Cl) Calcium nitrate (Ca (NaO3)2) Basic salt: The salt which is made from strong base and weak acid or on hydrolysis gives strong base and weak acid are called basic salt. Is an aqueous solution with H+ = 4.2 x 10-5 M classified as acidic, basic, or neutral? The reaction will always favor the formation of the _____ acid and base. Select all that apply. Blank 2: H or hydrogen - Karsten Apr 20, 2020 at 1:33 1 A particular salt contains both an acidic cation and a basic anion. For the following compound, predict whether the solution is acidic, basic, or neutral and why: NH_4Cl. HOWEVER, Ka = Kb, so the solution is neutral. Weak electrolytes include weak acids, weak bases, and a variety of other compounds. Since strong acids and strong bases readily accept and donate protons, the equilibrium will always favor the reaction of the _____ acid and base and the formation of the _____ acid and base. A) Weakly Acidic B) Strongly Basic C) Weakly Basic D) Neutral E) Strongly Acidic, Classify these salts as acidic, basic, or neutral Acidic Basic Neutral K_2SO_3 KCI NH_4CIO_4 NaCN LiNO_3. HCl (hydrochloric acid) HNO3 (nitric acid) HClO4 (perchloric acid) H2SO4 (sulfuric acid), NaOH (sodium hydroxide) KOH (potassium hydroxide) Ca(OH)2 (calcium hydroxide). The Periodic Table Lesson for Kids: Structure & Uses. water, forming ammonia and the hydronium ion. b. If the pH paper turns red, is the substance acidic, basic, or neutral? For example, NaOH + HCl = NaCl + H2O Since both the acid and base are strong, the salt produced would be neutral. A strong acid will cease to exist in aqueous solutions because water will readily accept its proton to form hydronium ions. So that's the answer. Question: Is B2 2-a Paramagnetic or Diamagnetic ? Since the ammonium So therefore we will have 4 possible types of acids and bases: 1. (this only works with monoprotic (having one mol of proton/H+/H3O+ per mol of acid) acids and bases) Reuben Asare Badu In terms of the Arrhenius definition of acids and bases, neutralization is described as _______. Show your work. Na+ and hydroxide ion and I will get my base Given the acid-base equilibrium HCN (aq) + HCO3- (aq) CN- (aq) + H2CO3 (aq); pKa for HCN = 9.2 and pKa for H2CO3 = 6.3. In this case, since both acetic acid and NH4OH have about the same Ka (or Kb), then the NH4C2H3O2 is about neutral. 20 ribeyes for $29 backyard butchers; difference between bailment and contract. For example in reactivity series there are mnemonics, so is there one for remembering weak and strong acids & bases? Explain. A Bronsted-Lowry base must contain an available pair of in its formula in order to form a(n) bond to H+. Blank 2: lone , nonbonded, nonbonding, non-bonding, non-bonded, unshared, or unbonded Ask students to predict if the solution is acid, basic, or neutral. can combine with OH-, this will go with OH-, and I'll get NH4OH and this is going to be a base. NaOH, sodium hydroxide. pH OF ACID SALT SOLUTIONS An acid salt is one that still contains H as part of the anion (HSO 4-, H 2PO 4-, HCO 3-, etc) Will the solution of such a salt be acidic due to the reaction: HCO 3-+ H 2O CO 3 2-+ H 3O + Ka2 = 4.7 x 10-11 Or will it be basic due to the reaction: HCO 3-+ H 2O H 2CO 3 + OH-Kb= K w = 1.0 x 10-14 Ka1 4.2x10-7 = 2.4 x 10-8 {/eq}, both are acid and base. HCN is a _____ acid than acetic acid and will therefore have a _____ pKa value. Question = Is CF2Cl2polar or nonpolar ? Okay, if you already are aware of this, let's move ahead. 1)FeCl 2)CaBr2 3)NaF. {/eq}, both are acid and base. Which one of the following 0.1 M salt solutions will be basic? Acetic acid; Ka = 1.7 x 10^-5 Ammonia; Kb = 1.8 x 10^-5 This problem has been solved! (see spelling differences), is a chemical reaction in which an acid and a base react quantitatively with each other. Are you looking for the best essay writers offering their assistance on the web? Is the solution of NaNO_3 acidic, basic or neutral? The latter reaction proceeds forward only to a small extent, the equilibrium Which of the following solutions of HCN will have the greatest percent dissociation? {/eq}. Classify these aqueous solutions as acidic, neutral, or basic. So we know that ions of acids and bases, they exchange position and The strongest acid in an aqueous solution is the hydronium ion. [{Blank}] (acidic, basic, neutral) (2) What are the acid-base properties of the anion? Intracellular pH values around 7 are maintained by various buffer systems, including CO 2 /H 2 CO 3 /HCO 3 , and by transmembrane ion transporters [24, 25]. Basic solutions will have a pOH than acidic solutions. 11.951 HCN has a Ka value of 6.3 x 10-10 while acetic acid has a Ka value of 1.8 x 10-5. In this lesson, you'll learn all about temperature. D) The salt is a product of a strong acid and a strong base. {eq}N{H_4}{C_2}{H_3}{O_2} + {H_2}O \to N{H_4}OH + C{H_3}COOH Titration is a procedure used in chemistry in order to determine the molarity of an acid or a base.A chemical reaction is set up between a known volume of a solution of unknown concentration and a known volume of a solution with a known concentration. Select all that apply. You'll get a detailed solution from a subject matter expert that helps you learn core concepts. Relationship between Ka and Kb of Conjugate Acid-Base Pairs. [{Blank}] (acidic, ba. This equation is used to find either Select all the statements that correctly describe this system. What is the pH of a solution that is 0.040 M in NH4Cl at 25 C? For example, the acetate ion is the conjugate base of acetic acid, a weak Would a 0.1 M aqueous solution of CuSO4 be acidic, basic, or neutral? Which of the following compounds can be classified as bases according to the Arrhenius definition? 4) Is the solution of CH3NH3CN acidic, basic or neutral? The solution is neutral. So see, the first step was, from the given salt, try to find out the acid and the base that could have reacted upon this. Now let's write down the And Cl-, chloride ion, will go with H+ and we will get HCl and we know that is an acid. 2) Is the solution of NH4NO2 acidic, basic or We will look at how the elements are ordered and what the row and column that an element is in tells us. Acids have a pH lesser than 7.0 and the lower it is, the stronger the acid becomes. So let's do that. The solution contains a significant concentration of the weak base CN-. Reason: NH4NO3 is the conjugate acid of the weak base ammonium hydroxide (NH4OH) and the strong acid nitric acid (HNO3). In this video, we are It will dissociate to NH4+ and C2H3O2- both are a weak acid (NH4) and weak base (C2H3O2) so Ka of NH4 is ~ to the Kb of acetate (C2H3O2) anion so overall the pH value wouldclose to7.00or. Is ammonium acetate (NH_4C_2H_3O_2) acidic, basic, or neutral? Weak acids and weak bases are weak electrolytes. If you are given a pH and asked to calculate [H+], you would _______. Perchlorate anion is the conjugate base of perchloric acid, which is a highl. Will an aqueous solution of NaNO2 be acidic, basic, or neutral? ion functions as a weak acid, the equilibrium constant is given the label So this is the first step. Which of the following statements correctly explains why it is reasonable to assume that for a weak acid [HA] at equilibrium is approximately equal to [HA]init under most circumstances? KOH is a strong base while H2S is a weak acid. 1)FeCl 2)CaBr2 3)NaF, Qualitatively predict the acidity/basicity of a 1.0 M solution of NH_4Br. But see, one thing to note over here is that HCl, this is a strong acid, and NaOH, this is a strong base. called the how of this. Polyprotic acids are generally weak acids. water it does not increase the concentration of either H+ or OH- and that's why we call this as a neutral salt. If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked. So you might recall that sodium hydroxide, this is a strong base. Blank 2: covalent, coordinate covalent, or dative covalent. All materials are barcoded. Instructions. Answer = SCl6 is Polar What is polarand non-polar? Soluble salts that contain anions derived from weak acids form solutions This lesson focuses on acids and bases, how to identify them, and the characteristics they have. The conjugate acid of a neutral base will have a charge of +1. All other trademarks and copyrights are the property of their respective owners. Like how is it that a strong acid reacts with a weak base to give me an acidic salt? NH4NO3 is the conjugate acid of the weak base ammonium hydroxide (NH4OH) and the strong acid nitric acid (HNO3). What is the [H3O+] in a 0.60 M solution of HNO2? salt. Lithium carbonate is somewhat toxic. Such a species is described as being . acid. The buffering range covers the weak acid pK a 1 pH unit. It is the conjugate acid of a weak base (NH4+ is the conjugate acid of NH3) and the conjugate base of a weak acid (NO2- is the conjugate base of HNO2).
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