Question 1

Calculate the pH for an aqueous solution of pyridine that contains 2.15 × 10-4 M hydroxide ion.

Accepted Answer

A) 4)65 × 10-11  
B) 2)15 × 10-4  
C) 3)67 
D) 10.33 
A) 4)65 × 10-11  
B) 2)15 × 10-4  
C) 3)67 
D) 10.33

Question 2

Using the conjugate acid-base pairs listed below,complete the following equation with the pair that gives an equilibrium constant Kc > 1.
_____ + HSO3- ⇌ _____ + H2SO3

Accepted Answer

A) CH3CO2H/ CH3CO2- 
B) HCO2H/ HCO2- 
C) HNO2/NO2- 
D) HNO3/NO3- 
A) CH3CO2H/ CH3CO2- 
B) HCO2H/ HCO2- 
C) HNO2/NO2- 
D) HNO3/NO3-

Question 3

What is the pH of a solution prepared by mixing 100.00 mL of 0.020 M Ca(OH)2 with 50.00 mL of 0.300 M NaOH? Assume that the volumes are additive.

Accepted Answer

A) 13.05 
B) 13.10 
C) 13.28 
D) 13.58 
A) 13.05 
B) 13.10 
C) 13.28 
D) 13.58

Question 4

Which acid of the following set has the strongest conjugate base?

Accepted Answer

A) CH4 
B) NH3 
C) H2O 
D) HF 
A) CH4 
B) NH3 
C) H2O 
D) HF

Question 5

Which Br∅nsted-Lowry acid is not considered to be a strong acid in water?

Accepted Answer

A) H I 
B) H Br  
C) H2S O3 
D) H NO3 
A) H I 
B) H Br  
C) H2S O3 
D) H NO3

Question 6

An Arrhenius acid is best defined as a

Accepted Answer

A) hydroxide donor. 
B) proton acceptor. 
C) substance that dissociates in water to produce aqueous hydrogen ions. 
D) substance that dissociates in water to produce aqueous hydroxide ions. 
A) hydroxide donor. 
B) proton acceptor. 
C) substance that dissociates in water to produce aqueous hydrogen ions. 
D) substance that dissociates in water to produce aqueous hydroxide ions.

Question 7

What is the weakest acid among the following?

Accepted Answer

A) SiH4 
B) PH3 
C) H2S 
D) HCl 
A) SiH4 
B) PH3 
C) H2S 
D) HCl

Question 8

Which is not a hydrate of a proton?

Accepted Answer

A) H3O+ 
B) H9O4+ 
C) H25O11+ 
D) H43O21+ 
A) H3O+ 
B) H9O4+ 
C) H25O11+ 
D) H43O21+

Question 9

What is the pH of a 0.40 M H2Se solution that has the stepwise dissociation constants
Ka1 = 1.3 × 10-4 and Ka2 = 1.0 × 10-11?

Accepted Answer

A) 2)14 
B) 3)89 
C) 4)28 
D) 5)57 
A) 2)14 
B) 3)89 
C) 4)28 
D) 5)57

Question 10

When dissolved in water,which compound is generally considered to be an Arrhenius acid?

Accepted Answer

A) H NO2 
B) KOH 
C) Li F  
D) CH3OH  
A) H NO2 
B) KOH 
C) Li F  
D) CH3OH

Question 11

A proton hydrated by four water molecules has the formula ________.

Accepted Answer

The answer of A proton hydrated by four water molecules...

Question 12

What is the relationship between Ka and Kb at 25°C for a conjugate acid base pair?

Accepted Answer

A) Ka × Kb = 1 × 10-14 
B) Ka/Kb = 1 × 10-14 
C) Kb/Ka = 1 × 10-14 
D) Ka + Kb = 1 × 10-14 
A) Ka × Kb = 1 × 10-14 
B) Ka/Kb = 1 × 10-14 
C) Kb/Ka = 1 × 10-14 
D) Ka + Kb = 1 × 10-14

Question 13

What is the strongest acid among the following?

Accepted Answer

A) HF 
B) HCl 
C) HBr 
D) HI 
A) HF 
B) HCl 
C) HBr 
D) HI

Question 14

-Which of the above pictures represents a solution of a weak diprotic acid H2A for which
Ka1 >> Ka2? (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 15

What is the strongest base among the following?

Accepted Answer

A) ClO- 
B) ClO2- 
C) ClO3- 
D) ClO4- 
A) ClO- 
B) ClO2- 
C) ClO3- 
D) ClO4-

Question 16

Calculate the pH of a 0.800 M NaCH3CO2 solution.Ka for acetic acid,CH3CO2H,is 1.89 × 10-5.

Accepted Answer

A) 2)42 
B) 4)68 
C) 9)32 
D) 11.58 
A) 2)42 
B) 4)68 
C) 9)32 
D) 11.58

Question 17

What are the Br∅nsted-Lowry bases in the following chemical reaction?
C5H5N(aq)+ H2O(l)⇌ C5H5NH+(aq)+ OH-(aq)

Accepted Answer

A) C5H5N,H2O 
B) C5H5N,C5H5NH+ 
C) C5H5N,OH- 
D) C5H5N,H2O,OH- 
A) C5H5N,H2O 
B) C5H5N,C5H5NH+ 
C) C5H5N,OH- 
D) C5H5N,H2O,OH-

Question 18

What is the conjugate base of the Br∅nsted-Lowry acid HPO42-?

Accepted Answer

A) H3PO4 
B) H2PO4- 
C) HPO42- 
D) PO43- 
A) H3PO4 
B) H2PO4- 
C) HPO42- 
D) PO43-

Question 19

What is the pH of a solution made by mixing 100.00 mL of 0.20 M HCl with 50.00 mL of 0.10 M HCl? Assume that the volumes are additive.

Accepted Answer

A) 0)15 
B) 0)52 
C) 0)78 
D) 1)70 
A) 0)15 
B) 0)52 
C) 0)78 
D) 1)70

Question 20

An acidic solution at 25°C will have a hydronium ion concentration ________ and a pH value ________.

Accepted Answer

A) [H3O+] > 1 × 10-7 M,pH > 7.00 B) [H3O+] > 1 × 10-7 M,pH 3O+] -7 M,pH > 7.00 D) [H3O+] -7 M,pH < 7.00 A) [H3O+] > 1 × 10-7 M,pH > 7.00 B) [H3O+] > 1 × 10-7 M,pH 3O+] -7 M,pH > 7.00 D) [H3O+] -7 M,pH < 7.00

Exam 14: Aqueous Equilibria: Acids and Bases

Calculate the pH for an aqueous solution of pyridine that contains 2.15 × 10-4 M hydroxide ion.

Using the conjugate acid-base pairs listed below,complete the following equation with the pair that gives an equilibrium constant Kc > 1. _____ + HSO3- ⇌ _____ + H2SO3

What is the pH of a solution prepared by mixing 100.00 mL of 0.020 M Ca(OH)2 with 50.00 mL of 0.300 M NaOH? Assume that the volumes are additive.

Which acid of the following set has the strongest conjugate base?

Which Br∅nsted-Lowry acid is not considered to be a strong acid in water?

An Arrhenius acid is best defined as a

What is the weakest acid among the following?

Which is not a hydrate of a proton?

What is the pH of a 0.40 M H2Se solution that has the stepwise dissociation constants Ka1 = 1.3 × 10-4 and Ka2 = 1.0 × 10-11?

When dissolved in water,which compound is generally considered to be an Arrhenius acid?

A proton hydrated by four water molecules has the formula ________.

What is the relationship between Ka and Kb at 25°C for a conjugate acid base pair?

What is the strongest acid among the following?

-Which of the above pictures represents a solution of a weak diprotic acid H2A for which Ka1 >> Ka2? (Water molecules have been omitted for clarity. )

What is the strongest base among the following?

Calculate the pH of a 0.800 M NaCH3CO2 solution.Ka for acetic acid,CH3CO2H,is 1.89 × 10-5.

What are the Br∅nsted-Lowry bases in the following chemical reaction? C5H5N(aq)+ H2O(l)⇌ C5H5NH+(aq)+ OH-(aq)

What is the conjugate base of the Br∅nsted-Lowry acid HPO42-?

What is the pH of a solution made by mixing 100.00 mL of 0.20 M HCl with 50.00 mL of 0.10 M HCl? Assume that the volumes are additive.

An acidic solution at 25°C will have a hydronium ion concentration ________ and a pH value ________.

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

Calculate the pH for an aqueous solution of pyridine that contains 2.15 × 10^-4 M hydroxide ion.

Using the conjugate acid-base pairs listed below,complete the following equation with the pair that gives an equilibrium constant K_c > 1. _ + HSO₃^- ⇌ _ + H₂SO₃

What is the pH of a solution prepared by mixing 100.00 mL of 0.020 M Ca(OH)₂ with 50.00 mL of 0.300 M NaOH? Assume that the volumes are additive.

What is the pH of a 0.40 M H₂Se solution that has the stepwise dissociation constants K_a1 = 1.3 × 10^-4 and K_a2 = 1.0 × 10^-11?

What is the relationship between K_a and K_b at 25°C for a conjugate acid base pair?

-Which of the above pictures represents a solution of a weak diprotic acid H₂A for which K_a1 >> K_a2? (Water molecules have been omitted for clarity. )

Calculate the pH of a 0.800 M NaCH₃CO₂ solution.K_a for acetic acid,CH₃CO₂H,is 1.89 × 10^-5.

What are the Br∅nsted-Lowry bases in the following chemical reaction? C₅H₅N(aq)+ H₂O(l)⇌ C₅H₅NH+(aq)+ OH-(aq)

What is the conjugate base of the Br∅nsted-Lowry acid HPO₄^2-?

An acidic solution at 25°C will have a hydronium ion concentration and a pH value .