Question 1

Identify the conjugate acid/base pairs present in an aqueous solution of hydrogen sulfate ion,
HSO4-.

Accepted Answer

A) HSO4-/SO42- and H3O+/H2O 
B) H2SO4/HSO4- and H2O/OH- 
C) HSO4-/H2O and H3O+/SO42- 
D) HSO4-/H2O and H2SO4/OH- 
A) HSO4-/SO42- and H3O+/H2O 
B) H2SO4/HSO4- and H2O/OH- 
C) HSO4-/H2O and H3O+/SO42- 
D) HSO4-/H2O and H2SO4/OH- A

Question 2

What is the strongest acid of the following?

Accepted Answer

A) HOI 
B) HOBr 
C) HOCl 
D) All are equivalent. 
A) HOI 
B) HOBr 
C) HOCl 
D) All are equivalent. C

Question 3

Which one of the following salts,when dissolved in water,produces the solution with the highest pH?

Accepted Answer

A) KI 
B) KBr 
C) KCl 
D) KF 
A) KI 
B) KBr 
C) KCl 
D) KF D

Question 4

What is the pH of a 0.0 40 M Ba(OH)2 solution?

Accepted Answer

A) 1)10 
B) 1)40 
C) 12.60 
D) 12.90 
A) 1)10 
B) 1)40 
C) 12.60 
D) 12.90

Question 5

What is the percent dissociation of a benzoic acid solution with pH = 2.59? The acid dissociation constant for this monoprotic acid is 6.5 × 10-5.

Accepted Answer

A) 0)50% 
B) 1)5% 
C) 2)5% 
D) 3)5% 
A) 0)50% 
B) 1)5% 
C) 2)5% 
D) 3)5%

Question 6

A solution with a hydroxide ion concentration of 4.15 × 10-4 M is ________ and has a hydrogen ion concentration of ________.

Accepted Answer

A) acidic,2.41 × 10-10 M 
B) acidic,2.41 × 10-11 M 
C) basic,2.41 × 10-10 M 
D) basic,2.41 × 10-11 M 
A) acidic,2.41 × 10-10 M 
B) acidic,2.41 × 10-11 M 
C) basic,2.41 × 10-10 M 
D) basic,2.41 × 10-11 M

Question 7

What is the pH of a 0.30 M pyridine solution that has a Kb = 1.9 × 10-9? The equation for the dissociation of pyridine is
C5H5N(aq)+ H2O(l)⇌ C5H5NH+(aq)+ OH-(aq).

Accepted Answer

A) 4)62 
B) 8)72 
C) 9)38 
D) 10.38 
A) 4)62 
B) 8)72 
C) 9)38 
D) 10.38

Question 8

Which of the following can be classified as a weak base?

Accepted Answer

A) CH3NH2 
B) NH2OH 
C) Both CH3NH2 and NH2OH 
D) Neither CH3NH2 nor NH2OH 
A) CH3NH2 
B) NH2OH 
C) Both CH3NH2 and NH2OH 
D) Neither CH3NH2 nor NH2OH

Question 9

What is the hydroxide ion concentration of a lye solution that has a pH of 9.20?

Accepted Answer

A) 6)31 × 10- 10 M 
B) 1)58 × 10- 5 M 
C) 4)80 M 
D) 9)20 M 
A) 6)31 × 10- 10 M 
B) 1)58 × 10- 5 M 
C) 4)80 M 
D) 9)20 M

Question 10

Determine the ammonia concentration of an aqueous solution that has a pH of 11.50.The equation for the dissociation of NH3 (Kb = 1.8 × 10-5)is
NH3(aq)+ H2O(l)⇌ NH4+(aq)+ OH-(aq).

Accepted Answer

A) 2)5 M 
B) 0)55 M 
C) 5)7 × 10-3 M 
D) 3)2 × 10-3 M 
A) 2)5 M 
B) 0)55 M 
C) 5)7 × 10-3 M 
D) 3)2 × 10-3 M

Question 11

-Of the elements indicated on the periodic table shown above,which forms the strongest oxoacid acid with the formula H2XO3 or HXO3,where X = A,B,C,or D?

Accepted Answer

A) A 
B) B 
C) C 
D) D 
A) A 
B) B 
C) C 
D) D

Question 12

At 50°C the value of Kw is 5.5 × 10-14.A basic solution at 50°C has

Accepted Answer

A) [H3O+] -] -7 M. 
B) [H3O+] -7 M -]. 
C) [H3O+] = [OH-] -7 M. 
D) [H3O+] > 2 × 10-7 M -]. 
A) [H3O+] -] -7 M. 
B) [H3O+] -7 M -]. 
C) [H3O+] = [OH-] -7 M. 
D) [H3O+] > 2 × 10-7 M -].

Question 13

In the following reaction the unshaded spheres represent H atoms.  
-Identify the Br∅nsted-Lowry acids.

Accepted Answer

A) (1)and (3) 
B) (1)and (4) 
C) (2)and (3) 
D) (2)and (4) 
A) (1)and (3) 
B) (1)and (4) 
C) (2)and (3) 
D) (2)and (4)

Question 14

What is the hydronium ion concentration of a 0.150 M hypochlorous acid solution with
Ka = 3.5 × 10-8? The equation for the dissociation of hypochlorous acid is:
HOCl(aq)+ H2O(l)⇌ H3O+(aq)+ OCl-(aq).

Accepted Answer

A) 1)9 × 10-4 M 
B) 7)2 × 10-4 M 
C) 2)8 × 10-5 M 
D) 7)2 × 10-5 M 
A) 1)9 × 10-4 M 
B) 7)2 × 10-4 M 
C) 2)8 × 10-5 M 
D) 7)2 × 10-5 M

Question 15

Bromothymol blue indicator changes color from yellow at a pH of 6.0 to blue at a pH of 7.6.Methyl red indicator changes color from red at a pH of 4.4 to yellow at a pH of 6.2.A sample of saliva having [H3O+] = 6.310 × 10-7 would impart a ________ color to bromothymol blue and a ________ color to methyl red.

Accepted Answer

Question 16

Calculate the pH of a 0.080 M carbonic acid solution,H2CO3(aq),that has the stepwise dissociation constants Ka1 = 4.3 × 10-7 and Ka2 = 5.6 × 10-11.

Accepted Answer

A) 1)10 
B) 3)73 
C) 6)37 
D) 10.25 
A) 1)10 
B) 3)73 
C) 6)37 
D) 10.25

Question 17

-Which of the above pictures represents a solution of a diprotic acid H2A for which Ka1 = $\infty$ and Ka2 is exceptionally small.(Water molecules have been omitted for clarity. )

Accepted Answer

A) picture (a) 
B) picture (b) 
C) picture (c) 
D) picture (d) 
A) picture (a) 
B) picture (b) 
C) picture (c) 
D) picture (d)

Question 18

An acidic solution at 25°C has

Accepted Answer

A) [H3O+] > [OH-] > 1 × 10-7 M. 
B) [H3O+] > 1 × 10-7 M > [OH-]. 
C) [H3O+] = [OH-] > 1 × 10-7 M. 
D) [H3O+] -7 M > [OH-]. 
A) [H3O+] > [OH-] > 1 × 10-7 M. 
B) [H3O+] > 1 × 10-7 M > [OH-]. 
C) [H3O+] = [OH-] > 1 × 10-7 M. 
D) [H3O+] -7 M > [OH-].

Question 19

What is the approximate pH of a solution X that gives the following responses with the indicators shown?

Accepted Answer

A) 4)8 - 6.0 
B) 6)0 - 7.6 
C) 7)6 - 8.2 
D) > 8.2 
A) 4)8 - 6.0 
B) 6)0 - 7.6 
C) 7)6 - 8.2 
D) > 8.2

Question 20

Which one of the following salts,when dissolved in water,produces the solution with the lowest pH?

Accepted Answer

A) NaCl 
B) NH4Cl 
C) MgCl2 
D) AlCl3 
A) NaCl 
B) NH4Cl 
C) MgCl2 
D) AlCl3

Exam 14: Aqueous Equilibria: Acids and Bases

Identify the conjugate acid/base pairs present in an aqueous solution of hydrogen sulfate ion, HSO4-.

What is the strongest acid of the following?

Which one of the following salts,when dissolved in water,produces the solution with the highest pH?

What is the pH of a 0.0 40 M Ba(OH)2 solution?

What is the percent dissociation of a benzoic acid solution with pH = 2.59? The acid dissociation constant for this monoprotic acid is 6.5 × 10-5.

A solution with a hydroxide ion concentration of 4.15 × 10-4 M is ________ and has a hydrogen ion concentration of ________.

What is the pH of a 0.30 M pyridine solution that has a Kb = 1.9 × 10-9? The equation for the dissociation of pyridine is C5H5N(aq)+ H2O(l)⇌ C5H5NH+(aq)+ OH-(aq).

Which of the following can be classified as a weak base?

What is the hydroxide ion concentration of a lye solution that has a pH of 9.20?

Determine the ammonia concentration of an aqueous solution that has a pH of 11.50.The equation for the dissociation of NH3 (Kb = 1.8 × 10-5)is NH3(aq)+ H2O(l)⇌ NH4+(aq)+ OH-(aq).

-Of the elements indicated on the periodic table shown above,which forms the strongest oxoacid acid with the formula H2XO3 or HXO3,where X = A,B,C,or D?

At 50°C the value of Kw is 5.5 × 10-14.A basic solution at 50°C has

In the following reaction the unshaded spheres represent H atoms. -Identify the Br∅nsted-Lowry acids.

What is the hydronium ion concentration of a 0.150 M hypochlorous acid solution with Ka = 3.5 × 10-8? The equation for the dissociation of hypochlorous acid is: HOCl(aq)+ H2O(l)⇌ H3O+(aq)+ OCl-(aq).

Calculate the pH of a 0.080 M carbonic acid solution,H2CO3(aq),that has the stepwise dissociation constants Ka1 = 4.3 × 10-7 and Ka2 = 5.6 × 10-11.

-Which of the above pictures represents a solution of a diprotic acid H2A for which Ka1 = ∞\infty∞ and Ka2 is exceptionally small.(Water molecules have been omitted for clarity. )

An acidic solution at 25°C has

What is the approximate pH of a solution X that gives the following responses with the indicators shown?

Which one of the following salts,when dissolved in water,produces the solution with the lowest pH?

Chemistry: Matter and Measurement

Atoms, molecules, and Ions

Formulas, equations, and Moles

Reactions in Aqueous Solutions

Periodicity and the Atomic Structure of Atoms

Ionic Bonds and Some Main-Group Chemistry

Covalent Bonds and Molecular Structure

Thermochemistry: Chemical Energy

Gases: Their Properties and Behavior

Liquids,solids,and Phase Changes

Solutions and Their Properties

Chemical Kinetics

Chemical Equilibrium

Applications of Aqueous Equilibria

Thermodynamics: Entropy, free Energy, and Equilibrium

Electrochemistry

Hydrogen, oxygen, and Water

The Main-Group Elements

Transition Elements and Coordination Chemistry

Metals and Solid-State Materials

Nuclear Chemistry

Organic and Biological Chemistry

Filters

Identify the conjugate acid/base pairs present in an aqueous solution of hydrogen sulfate ion, HSO₄^-.

What is the pH of a 0.0 40 M Ba(OH)₂ solution?

What is the percent dissociation of a benzoic acid solution with pH = 2.59? The acid dissociation constant for this monoprotic acid is 6.5 × 10^-5.

A solution with a hydroxide ion concentration of 4.15 × 10^-4 M is and has a hydrogen ion concentration of .

What is the pH of a 0.30 M pyridine solution that has a K_b = 1.9 × 10^-9? The equation for the dissociation of pyridine is C₅H₅N(aq)+ H₂O(l)⇌ C₅H₅NH⁺(aq)+ OH^-(aq).

Determine the ammonia concentration of an aqueous solution that has a pH of 11.50.The equation for the dissociation of NH₃ (K_b = 1.8 × 10^-5)is NH₃(aq)+ H₂O(l)⇌ NH₄⁺(aq)+ OH^-(aq).

-Of the elements indicated on the periodic table shown above,which forms the strongest oxoacid acid with the formula H₂XO₃ or HXO₃,where X = A,B,C,or D?

At 50°C the value of K_w is 5.5 × 10^-14.A basic solution at 50°C has

What is the hydronium ion concentration of a 0.150 M hypochlorous acid solution with K_a = 3.5 × 10^-8? The equation for the dissociation of hypochlorous acid is: HOCl(aq)+ H₂O(l)⇌ H₃O⁺(aq)+ OCl^-(aq).

Calculate the pH of a 0.080 M carbonic acid solution,H₂CO₃₍_aq_),that has the stepwise dissociation constants K_a1 = 4.3 × 10^-7 and K_a2 = 5.6 × 10^-11.