Question 1

Hydrofluoric acid, HF, is a weak acid. Which of the following is the correct expression for the Ka of hydrofluoric acid?

Accepted Answer

A)  [H3O+][HF]/[F-] 
B)  [HF]/[ H3O+][F-] 
C)  [H3O+][F-]/[HF] 
D)  [HF][F-]/[ H3O+] 
A)  [H3O+][HF]/[F-] 
B)  [HF]/[ H3O+][F-] 
C)  [H3O+][F-]/[HF] 
D)  [HF][F-]/[ H3O+] C

Question 2

Examine the activity series given below.  
-Examine the following image.   Which of the following substances might be present in the beaker?

Accepted Answer

A)  0.10 M HCl 
B)  0.10 M NH3 
C)  0.10 M KOH 
D)  none of these 
A)  0.10 M HCl 
B)  0.10 M NH3 
C)  0.10 M KOH 
D)  none of these D

Question 3

Which of the following pH's corresponds to a slightly acidic solution?

Accepted Answer

A)  2.8 
B)  6.8 
C)  7.2 
D)  11.2 
A)  2.8 
B)  6.8 
C)  7.2 
D)  11.2 B

Question 4

Which of the following is the conjugate base of H3PO4?

Accepted Answer

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

Question 5

Which of the following is the conjugate acid of HPO42-

Accepted Answer

A)  H3PO4 
B)  H2PO4- 
C)  PO43- 
D)  H3O+ 
A)  H3PO4 
B)  H2PO4- 
C)  PO43- 
D)  H3O+

Question 6

In an acid-base equilibrium the equilibrium lies in the direction which favors which species?

Accepted Answer

A)  the weaker acid 
B)  the weaker base 
C)  both a and b 
D)  neither a nor b 
A)  the weaker acid 
B)  the weaker base 
C)  both a and b 
D)  neither a nor b

Question 7

As given in the text, which of the following appears in the denominator of the fractional term of the Henderson-Hasselbalch equation?

Accepted Answer

A)  the amount of the conjugate base 
B)  the amount of weak acid 
C)  the concentration of conjugate base 
D)  the concentration of weak acid 
A)  the amount of the conjugate base 
B)  the amount of weak acid 
C)  the concentration of conjugate base 
D)  the concentration of weak acid

Question 8

When comparing the strength of two weak acids which factor do we use to determine which is the stronger of the two?

Accepted Answer

A)  the formula weights of the acids 
B)  the number of protons the acids can lose 
C)  the size of the acid dissociation constants 
D)  none of the above 
A)  the formula weights of the acids 
B)  the number of protons the acids can lose 
C)  the size of the acid dissociation constants 
D)  none of the above

Question 9

Which of the following is characteristic of a buffer?

Accepted Answer

A)  The pH will go down significantly when H3O+ is added to the buffer. 
B)  The pH will go down very slightly when H3O+ is added to a buffer. 
C)  The pH will go up significantly when H3O+ is added to the buffer. 
D)  The pH will go up very slightly when H3O+ is added to the buffer. 
A)  The pH will go down significantly when H3O+ is added to the buffer. 
B)  The pH will go down very slightly when H3O+ is added to a buffer. 
C)  The pH will go up significantly when H3O+ is added to the buffer. 
D)  The pH will go up very slightly when H3O+ is added to the buffer.

Question 10

As given in the text, which of the following appears in the numerator of the fractional term of the Henderson-Hasselbalch equation?

Accepted Answer

A)  the amount of the conjugate base 
B)  the amount of weak acid 
C)  the concentration of conjugate base 
D)  the concentration of weak acid 
A)  the amount of the conjugate base 
B)  the amount of weak acid 
C)  the concentration of conjugate base 
D)  the concentration of weak acid

Question 11

Which of the following is true of pure water?

Accepted Answer

A)  [H3O+] 3O+] = [OH-] 
C)  [H3O+] > [OH-] 
D)  pure water is an electrolyte 
A)  [H3O+] 3O+] = [OH-] 
C)  [H3O+] > [OH-] 
D)  pure water is an electrolyte

Question 12

In an acid-base equilibrium the equilibrium lies in the direction which favors which species?

Accepted Answer

A)  the stronger acid 
B)  the stronger base 
C)  both a and b 
D)  neither a nor b 
A)  the stronger acid 
B)  the stronger base 
C)  both a and b 
D)  neither a nor b

Question 13

The Ka for boric acid is 7.3 × 10¯10. What is the pKa of boric acid?

Accepted Answer

A)  -9.14 
B)  -4.86 
C)  4.86 
D)  9.14 
A)  -9.14 
B)  -4.86 
C)  4.86 
D)  9.14

Question 14

Examine the activity series given below.  
-Examine the following image.   How would the solution in the beaker be classified?

Accepted Answer

A)  basic 
B)  acidic 
C)  neutral 
A)  basic 
B)  acidic 
C)  neutral

Question 15

Which of the following is the conjugate acid of H2PO4-?

Accepted Answer

A)  H3PO4 
B)  HPO42- 
C)  PO43- 
D)  H3O+ 
A)  H3PO4 
B)  HPO42- 
C)  PO43- 
D)  H3O+

Question 16

Which of the following can be characterized as a strong electrolyte?

Accepted Answer

A)  0.001 M HCl 
B)  3.0 M HCl 
C)  both a and b 
D)  neither a nor b 
A)  0.001 M HCl 
B)  3.0 M HCl 
C)  both a and b 
D)  neither a nor b

Question 17

What is the name of the acid which dissociates to give the nitrite ion, NO2-?

Accepted Answer

A)  hydronitric acid 
B)  nitric acid 
C)  nitritic acid 
D)  nitrous acid 
A)  hydronitric acid 
B)  nitric acid 
C)  nitritic acid 
D)  nitrous acid

Question 18

Which of the following species can be characterized as amphiprotic?

Accepted Answer

A)  H2O 
B)  HCO3- 
C)  HPO42- 
D)  all of them 
A)  H2O 
B)  HCO3- 
C)  HPO42- 
D)  all of them

Question 19

Which of the following solutions can function as a buffer?

Accepted Answer

A)  a solution containing HCl and NaCl 
B)  a solution containing NaOH and NaCl 
C)  a solution containing NH3 and NH4Cl 
D)  none of the above 
A)  a solution containing HCl and NaCl 
B)  a solution containing NaOH and NaCl 
C)  a solution containing NH3 and NH4Cl 
D)  none of the above

Question 20

Which of the following occurs when an acid reacts with an active metal?

Accepted Answer

A)  The metal is reduced. 
B)  The water is oxidized. 
C)  both a and b 
D)  neither a nor b 
A)  The metal is reduced. 
B)  The water is oxidized. 
C)  both a and b 
D)  neither a nor b

Exam 8: Acids and Bases

Hydrofluoric acid, HF, is a weak acid. Which of the following is the correct expression for the Ka of hydrofluoric acid?

Examine the activity series given below. -Examine the following image. Which of the following substances might be present in the beaker?

Which of the following pH's corresponds to a slightly acidic solution?

Which of the following is the conjugate base of H3PO4?

Which of the following is the conjugate acid of HPO42-

In an acid-base equilibrium the equilibrium lies in the direction which favors which species?

As given in the text, which of the following appears in the denominator of the fractional term of the Henderson-Hasselbalch equation?

When comparing the strength of two weak acids which factor do we use to determine which is the stronger of the two?

Which of the following is characteristic of a buffer?

As given in the text, which of the following appears in the numerator of the fractional term of the Henderson-Hasselbalch equation?

Which of the following is true of pure water?

In an acid-base equilibrium the equilibrium lies in the direction which favors which species?

The Ka for boric acid is 7.3 × 10¯10. What is the pKa of boric acid?

Examine the activity series given below. -Examine the following image. How would the solution in the beaker be classified?

Which of the following is the conjugate acid of H2PO4-?

Which of the following can be characterized as a strong electrolyte?

What is the name of the acid which dissociates to give the nitrite ion, NO2-?

Which of the following species can be characterized as amphiprotic?

Which of the following solutions can function as a buffer?

Which of the following occurs when an acid reacts with an active metal?

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Filters

Hydrofluoric acid, HF, is a weak acid. Which of the following is the correct expression for the K_a of hydrofluoric acid?

Which of the following is the conjugate base of H₃PO₄?

Which of the following is the conjugate acid of HPO₄^2-

The K_a for boric acid is 7.3 × 10^¯10. What is the pK_a of boric acid?

Which of the following is the conjugate acid of H₂PO₄^-?

What is the name of the acid which dissociates to give the nitrite ion, NO₂^-?