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Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640

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Section
BuyFindarrow_forward

Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640
Chapter 16.9, Problem 1RC
Textbook Problem
137 views

Which of the following is the stronger acid?

  1. (a) H2SeO4
  2. (b) H2SeO3

Interpretation Introduction

Interpretation:

The strongest acid should be identified given the two different of selenium oxide molecules.

Concept introduction:

Strong acid: Acid solutions contains hydrigen ions, the higher concentration of hydrogen ions, the lower pH for example hydrochloric acid is strong acid when comapre to acetic acid it is a weakr acid. Hence srong acids are completely ionizaes but weak acids are only partly ionizaed in the solution.

pKa: It is introduced as an index to express the acidity of weak acids, where pKa is defined as fallows, we consider the Ka constant for acetic acid 1.8×105(pKa) but pKa constant for is 4.8 which is a simpler expression. Furthermore the smaller pKa value has strongest acid.

An acid-base reaction reaction is represented as written below.

HA(aq)+B(aq)   BH+(aq)  +    A(aq)(acid)    (base)        (conjugate     acid)   (conjugate     base)

The base will take up the proton from acid and form its conjugate acid and simultaneously acid will form its conjugate base. The equilibrium will be forward or backward can be determined by using the dissociation constants (Kaand Kb) for reactants as well as of the products. The more the value of Ka for an acid, stronger will be the acid and it will undergo faster ionization. Similarly, higher the value of Kb for a base, stronger will be the base and it will undergo faster ionization.

Explanation of Solution

Reason for correct answer:

The option (a) is correct one because the number of oxygen atom attached on central selenium (Se) atom, than more number of oxygen more will be acidic character.

Further the selenium electronegative character higher when compare to molecule (b)...

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Chapter 16 Solutions

Chemistry & Chemical Reactivity
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Ch. 16.3 - 3. Which of the following has a pKa value of...Ch. 16.3 - 4. What is the pK2 for the conjugate acid of...Ch. 16.3 - Ka for lactic acid, CH3CHOHCO2H, is 1.4 x 104....Ch. 16.4 - For each of the following salts in water, predict...Ch. 16.4 - 1. Adding NaH2PO4 to water will cause the pH...Ch. 16.4 - 2. Adding KCN to water will cause the pH...Ch. 16.5 - (a) Which is the stronger Bronsted acid, HCO3 or...Ch. 16.5 - 1. Is the reaction of NaCN and HCI in water...Ch. 16.5 - 2. In the following reaction, does the equilibrium...Ch. 16.6 - Equal amounts (moles) of HCl(aq) and NaCN(aq) are...Ch. 16.6 - 2. Equal amounts (moles) of acetic acid(aq) and...Ch. 16.6 - Equal amounts (moles) of NaOH(aq) and NaH2PO4(aq)...Ch. 16.7 - A solution prepared from 0.055 mol of butanoic...Ch. 16.7 - What are the equilibrium concentrations of acetic...Ch. 16.7 - What are the equilibrium concentrations of HF, F...Ch. 16.7 - The weak base, CIO (hypochlorite ion), is used in...Ch. 16.7 - Calculate the pH after mixing 15 mL of 0.12 M...Ch. 16.7 - 1. What is [H3O+] in a 0.10 M solution of HCN at...Ch. 16.7 - 2. A 0.040 M solution of an acid, HA, has a pH of...Ch. 16.7 - What are the pH and ion concentrations in a...Ch. 16.7 - 4. You mix 0.40 g of NaOH with 100 mL of 0.10 M...Ch. 16.7 - If a fatal does of atropine is 100. mg. what...Ch. 16.7 - When atropine is added to sulfuric acid, a proton...Ch. 16.7 - The pKa, of the conjugate acid of atropine is...Ch. 16.8 - What is the pH of a 0.10 M solution of oxalic...Ch. 16.8 - Hydrazine (N2H4) is like CO32 in that it is a...Ch. 16.9 - Which of the following is the stronger acid? (a)...Ch. 16.9 - Which of the following should be the stronger...Ch. 16.9 - 3. Which of the following should be the stronger...Ch. 16.10 - 1. Which of the following can act as a Lewis acid?...Ch. 16.10 - 2. The molecule whose structure is illustrated...Ch. 16.10 - Convert the pK values to K values for the...Ch. 16.10 - Other solvents also undergo autoionization. (a)...Ch. 16.10 - Write an equation for the reaction of the amide...Ch. 16.10 - Will a solution of HClO4 in glacial acetic acid be...Ch. 16.10 - To measure the relative strengths of bases...Ch. 16 - Write the formula and the give the name of the...Ch. 16 - Write the formula and give the name of the...Ch. 16 - What are the products of each of the following...Ch. 16 - What are the products of each of the following...Ch. 16 - Write balanced equations showing how the hydrogen...Ch. 16 - Write a balanced equation showing how the HPO42...Ch. 16 - In each of the following acid-base reactions,...Ch. 16 - In each of the following acid-base reactions,...Ch. 16 - An aqueous solution has a pH of 3.75. What is the...Ch. 16 - A saturated solution of milk of magnesia. Mg(OH)2,...Ch. 16 - What is the pH of a 0.0075 M solution of HCl? What...Ch. 16 - What is the pH of a 1.2 104 M solution of KOH?...Ch. 16 - What is the pH of a 0.0015 M solution of Ba(OH)2?Ch. 16 - The pH of a solution of Ba(OH)2 is 10.66 at 25 ....Ch. 16 - Several acids are listed here with their...Ch. 16 - Several acids are listed here with their...Ch. 16 - Which of the following ions or compounds has the...Ch. 16 - Which of the following compounds or ions has the...Ch. 16 - Which of the following compounds or ions has the...Ch. 16 - Which of the following compounds or ion has the...Ch. 16 - Dissolving K2CO3 in water gives a basic solution....Ch. 16 - Dissolving ammonium bromide in water gives an...Ch. 16 - If each of the salts listed here were dissolved in...Ch. 16 - Which of the following common food additives gives...Ch. 16 - A weak acid has a Ka of 6.5 105 What is the value...Ch. 16 - If Ka for weak acid is 2.4 1011, what is the...Ch. 16 - Epinephrine hydrochloride has pKa value of 9.53....Ch. 16 - An organic acid has pKa = 8.95. What is its Ka...Ch. 16 - Which is the stronger of the following two acids?...Ch. 16 - Which is the stronger of the following two acids?...Ch. 16 - Chloroacetic acid (ClCH2CO2H) has Ka = 1.41 103....Ch. 16 - A weak base has Kb = 1.5 109. What is the value...Ch. 16 - The trimethylammonium ion, (CH3)3NH+, is the...Ch. 16 - The chromium(III) ion in water, [Cr(H2O)6]3+. Is a...Ch. 16 - Acetic acid and sodium hydrogen carbonate, NaHCO3,...Ch. 16 - Ammonium chloride and sodium dihydrogen phosphate,...Ch. 16 - For each of the following reactions, predict...Ch. 16 - For each of the following reactions, predict...Ch. 16 - Equal molar quantities of sodium hydroxide and...Ch. 16 - Equal molar quantities of hydrochloric acid and...Ch. 16 - Equal molar quantities of acetic acid and sodium...Ch. 16 - Equal molar quantities of ammonia and sodium...Ch. 16 - A 0.015 M solution of hydrogen cyanate, HOCN, has...Ch. 16 - A 0.10 M solution of chloroacetic acid, CICH2CO2H,...Ch. 16 - A 0.025 M solution of hydroxyl amine has a pH of...Ch. 16 - Methylamine, CH3NH2, is a weak base. CH3NH2(aq) +...Ch. 16 - A 2.5 103 M solution of an unknown acid has a pH...Ch. 16 - A 0.015M solution of a base has a pH of 10.09 a)...Ch. 16 - What are the equilibrium concentrations of...Ch. 16 - The ionizations constant of a very weak acid, HA...Ch. 16 - What are the equilibrium concentration of H3O+, CN...Ch. 16 - Phenol (C6H5OH) commonly called carbolic acid is a...Ch. 16 - What are the equilibrium concentrations of...Ch. 16 - A hypothetical weak base has Kb=5.0104.Calculate...Ch. 16 - The weak base methylamine, CH3NH2, has Kb=4.2104....Ch. 16 - Calculate the pH of a 0.12 M aqueous solution of...Ch. 16 - Calculate the pH of a 0.0010 M aqueous solution of...Ch. 16 - A solution of hydrofluoric acid, HF, has a pH of...Ch. 16 - Calculate the hydronium ion concentration and pH...Ch. 16 - Calculate the hydronium ion concentration and pH...Ch. 16 - Sodium cyanide is the salt of the weak acid HCN....Ch. 16 - The sodium salt of propionic acid, NaCH3CH2CO2 is...Ch. 16 - Calculate the hydronium ion concentration and pH...Ch. 16 - Calculate the hydronium ion concentration and the...Ch. 16 - For each of the following cases, decide whether...Ch. 16 - For each of the following cases, decide whether...Ch. 16 - Oxalic acid, H2C2O4, is a diprotic acid. Write a...Ch. 16 - Sodium carbonate is a diprotic base. Write a...Ch. 16 - Prove that Ka1 Kb2 = Kw for oxalic acid H2C2O4,...Ch. 16 - Prove that Ka3 Kb1 = Kw for phosphoric acid,...Ch. 16 - Sulphurous acid, H2SO3, is a weak acid capable of...Ch. 16 - Ascorbic acid (vitamin C, C6H8O6) is a diprotic...Ch. 16 - Hydrazine, N2H4, can interact with water in two...Ch. 16 - Ethylene diamine, H2NCH2CH2NH2, can interact with...Ch. 16 - Which should be stronger acid, HOCN or HCN?...Ch. 16 - Which should be the stronger Brnsted acid,...Ch. 16 - Explain why benzene sulfonic acid is a Brnsted...Ch. 16 - The structure of ethylene diamine is illustrated...Ch. 16 - Decide whether each of the following substances...Ch. 16 - Decide whether each of the following substances...Ch. 16 - Carbon monoxide forms complexes with low-valent...Ch. 16 - Trimethylamine, (CH3)3N, is a common reagent. It...Ch. 16 - About this time, you may be wishing you had an...Ch. 16 - Consider the following ions: NH4+, CO32, Br, S2,...Ch. 16 - A 2.50 g sample of a solid that could be Ba(OH)2...Ch. 16 - In a particular solution, acetic acid is 11%...Ch. 16 - Hydrogen, H2S, and sodium acetate, NaCH3CO2 are...Ch. 16 - For each of the following reactions predict...Ch. 16 - A monoprotic acid HX has Ka = 1.3 103. Calculate...Ch. 16 - Arrange the following 0.10M solutions in order of...Ch. 16 - m-Nitrophenol, a weak acid, can be used as a pH...Ch. 16 - The butylammonium ion, C4H9NH3+, has a Ka of 2.3 ...Ch. 16 - The local anaesthetic novocaine is the hydrogen...Ch. 16 - Pyridine is weak organic base and readily forms a...Ch. 16 - The base ethylamine (CH3CH2NH2) has a Kb of. A...Ch. 16 - Chloroacetic acid, ClCH2CO2H, is a moderately weak...Ch. 16 - Saccharin (HC7H4NO3S) is a weak acid with pKa =...Ch. 16 - Given the following solutions: (a) 0.1 M NH3 (b)...Ch. 16 - For each of the following salts, predict whether a...Ch. 16 - Nicotine, C10H14N2, has two basic nitrogen atoms...Ch. 16 - Oxalic acid is a relatively weak diprotic acid....Ch. 16 - The equilibrium constant for the reaction of...Ch. 16 - The equilibrium constant for the reaction of...Ch. 16 - Calculate the pH of the solution that results from...Ch. 16 - To what volume should 1.00 102 mL of any weak...Ch. 16 - The hydrogen phthalate ion, C8HsO4, is a weak acid...Ch. 16 - You prepare a 0.10 M solution of oxalic acid,...Ch. 16 - You mix 30 0 mL of 0.15 M NaOH with 30.0 mL of...Ch. 16 - Describe an experiment that will allow you to...Ch. 16 - The data below compare the strength of acetic acid...Ch. 16 - You have three solutions labeled A, B, and C. You...Ch. 16 - A hydrogen atom in the organic base pyridine,...Ch. 16 - Nicotinic acid, C6H5NO2, is found in minute...Ch. 16 - Equilibrium constants can be measured for the...Ch. 16 - Sulfanilic acid, which is used in making dyes, is...Ch. 16 - Amino acids are an important group of compounds....Ch. 16 - How can water be both a Brnsied base and a Lewis...Ch. 16 - The nickel(II) ion exists as [Ni(H2O)4]2+ in...Ch. 16 - The halogens form three stable, weak acids, HOX....Ch. 16 - The acidity of the oxoacids was described in...Ch. 16 - Perchloric acid behaves as an acid, even when it...Ch. 16 - You purchase a bottle of water. On checking its...Ch. 16 - Iodine, I2, is much more soluble in an aqueous...Ch. 16 - Uracil is a base found in RNA Indicate sites in...Ch. 16 - Chemists often refer to the decree of ionization...Ch. 16 - Consider a salt of a weak base and a weak acid...

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