Question 1

A 50.0-mL sample of 0.50 M HCl is titrated with 0.50 M NaOH. What is the pH of the solution after 28.0 mL of NaOH have been added to the acid?

Accepted Answer

A)   0.85
B)   0.75
C)   0.66
D)   0.49
E)   3.8F) B) and D)
G) A) and D)

Question 2

Increasing the concentrations of the components of a buffer solution will increase the buffer range.

Accepted Answer

A) True 
 B)False

Question 3

A CH3COOH/CH3COO- buffer can be produced by adding a strong acid to a solution of CH3COO- ions.

Accepted Answer

A) True 
 B)False

Question 4

A solution is prepared by adding 500 mL of 0.3 M NaClO to 500 mL of 0.4 M HClO. What is the pH of this solution?

Accepted Answer

A)   The pH will be greater than the pKa of hypochlorous acid.
B)   The pH will be less than the pKa of hypochlorous acid.
C)   The pH will be equal to the pKa of hypochlorous acid.
D)   The pH will equal the pKb of sodium hypochlorite.
E)   None of these choices are correct.F) None of the above
G) A) and E)

Question 5

Two buffer solutions are prepared using acetic acid and sodium acetate. Solution A contains 20.0 g of acetic acid (CH3COOH)  and 5.0 g of sodium acetate CH3COONa) . Solution B contains 10.0 g of acetic acid and 25.0 g of sodium acetate. What is the difference between the pH values of these two solutions? For acetic acid, Ka = 1.8 × 10-5.

Accepted Answer

A)   0.0
B)   1.0
C)   2.0
D)   2.3
E)   4.6F) A) and E)
G) B) and D)

Question 6

A 20.0-mL sample of 0.25 M HNO3 is titrated with 0.15 M NaOH. What is the pH of the solution after 30.0 mL of NaOH have been added to the acid?

Accepted Answer

A)   2.00
B)   1.60
C)   1.05
D)   1.00
E)   None of these choices are correct.F) B) and E)
G) D) and E)

Question 7

The salts X(NO3) 2 and Y(NO3) 2 (where X+ and Y+ are metal ions)  are dissolved in water to give a solution which is 0.1 M in each of them. Using the Ksp values listed below, decide which aqueous reagent, if any, will definitely precipitate X+ before precipitating Y+ from solution. Given Ksp values:
XCl2, 1 × 10-5 YCl2, 1 × 10-10 X(OH) 2, 1 × 10-10 Y(OH) 2, 1 × 10-5

Accepted Answer

A)   1 M NH3
B)   1 M HCl
C)   1 M HNO3
D)   1 M NaCl
E)   None of these choices are correct.F) A) and E)
G) A) and B)

Question 8

What will be the effect of adding 0.5 mL of 0.1 M HCl to 100 mL of a phosphate buffer in which [H2PO4-] = [HPO42-] = 0.35 M?

Accepted Answer

A)   The pH will increase slightly.
B)   The pH will increase significantly.
C)   The pH will decrease slightly.
D)   The pH will decrease significantly.
E)   Since it is a buffer solution, the pH will not be affected.F) A) and B)
G) B) and C)

Question 9

An acetic acid buffer containing 0.50 M CH3COOH and 0.50 M CH3COONa has a pH of 4.74. What will the pH be after 0.0020 mol of HCl has been added to 100.0 mL of the buffer?

Accepted Answer

A)   4.77
B)   4.71
C)   4.68
D)   4.62
E)   None of these choices are correct.F) A) and B)
G) B) and D)

Question 10

What is the maximum mass of KCl that can be added to1.0 L of a 0.010 M lead(II)  chloride solution without causing any precipitation of lead(II)  chloride? Assume that addition of KCl does not affect the solution volume. For lead(II)  chloride, Ksp = 1.6 × 10-5.

Accepted Answer

A)   3.0 g
B)   1.5 g
C)   0.8 g
D)   1.0 g
E)   0.2 gF) C) and D)
G) A) and B)

Question 11

A 10.0-mL sample of 0.75 M CH3CH2COOH is titrated with 0.30 M NaOH. What is the pH of the solution after 22.0 mL of NaOH have been added to the acid? Ka = 1.3 × 10-5

Accepted Answer

A)   5.75
B)   4.94
C)   4.83
D)   4.02
E)   3.95F) A) and C)
G) B) and E)

Question 12

A formic acid buffer containing 0.50 M HCOOH and 0.50 M HCOONa has a pH of 3.77. What will the pH be after 0.010 mol of NaOH has been added to 100.0 mL of the buffer?

Accepted Answer

A)   3.67
B)   3.78
C)   3.81
D)   3.85
E)   3.95F) C) and E)
G) A) and B)

Question 13

A 25.0-mL sample of 1.00 M NH3 is titrated with 0.15 M HCl. What is the pH of the solution after 15.00 mL of acid have been added to the ammonia solution? Kb = 1.8 × 10-5

Accepted Answer

A)   10.26
B)   9.30
C)   9.21
D)   8.30
E)   8.21F) A) and E)
G) A) and D)

Question 14

What is the [H3O+] in a solution that consists of 0.15 M C2N2H8 (ethylene diamine)  and 0.35 C2N2H9Cl? Kb = 4.7 × 10-4

Accepted Answer

A)   2.0 × 10-3 M
B)   1.1 × 10-3 M
C)   6.3 × 10-9 M
D)   2.1 × 10-10 M
E)   5.0 × 10-11 MF) A) and E)
G) A) and B)

Exam 19: Ionic Equilibria in Aqueous Systems

A 25.0-mL sample of 1.00 M NH₃ is titrated with 0.15 M HCl. What is the pH of the solution after 15.00 mL of acid have been added to the ammonia solution? K_b = 1.8 × 10^-5

Correct Answer
verified

What will be the effect of adding 0.5 mL of 0.1 M HCl to 100 mL of a phosphate buffer in which [H₂PO₄^-] = [HPO₄^2-] = 0.35 M?

Correct Answer
verified

A 10.0-mL sample of 0.75 M CH₃CH₂COOH is titrated with 0.30 M NaOH. What is the pH of the solution after 22.0 mL of NaOH have been added to the acid? K_a = 1.3 × 10^-5

Correct Answer
verified

Correct Answer
verified

A solution is prepared by adding 500 mL of 0.3 M NaClO to 500 mL of 0.4 M HClO. What is the pH of this solution?

Correct Answer
verified

A 20.0-mL sample of 0.25 M HNO₃ is titrated with 0.15 M NaOH. What is the pH of the solution after 30.0 mL of NaOH have been added to the acid?

Correct Answer
verified

Increasing the concentrations of the components of a buffer solution will increase the buffer range.

Correct Answer
verified

What is the maximum mass of KCl that can be added to1.0 L of a 0.010 M lead(II) chloride solution without causing any precipitation of lead(II) chloride? Assume that addition of KCl does not affect the solution volume. For lead(II) chloride, K_sp = 1.6 × 10^-5.

Correct Answer
verified

A formic acid buffer containing 0.50 M HCOOH and 0.50 M HCOONa has a pH of 3.77. What will the pH be after 0.010 mol of NaOH has been added to 100.0 mL of the buffer?

Correct Answer
verified

A 50.0-mL sample of 0.50 M HCl is titrated with 0.50 M NaOH. What is the pH of the solution after 28.0 mL of NaOH have been added to the acid?

Correct Answer
verified

What is the [H₃O⁺] in a solution that consists of 0.15 M C₂N₂H₈ (ethylene diamine) and 0.35 C₂N₂H₉Cl? K_b = 4.7 × 10^-4

Correct Answer
verified

An acetic acid buffer containing 0.50 M CH₃COOH and 0.50 M CH₃COONa has a pH of 4.74. What will the pH be after 0.0020 mol of HCl has been added to 100.0 mL of the buffer?

Correct Answer
verified

Correct Answer
verified

A CH₃COOH/CH₃COO- buffer can be produced by adding a strong acid to a solution of CH₃COO- ions.

Correct Answer
verified

Exam 19: Ionic Equilibria in Aqueous Systems

A 25.0-mL sample of 1.00 M NH3 is titrated with 0.15 M HCl. What is the pH of the solution after 15.00 mL of acid have been added to the ammonia solution? Kb = 1.8 × 10-5

Correct AnswerverifiedShow Answer

What will be the effect of adding 0.5 mL of 0.1 M HCl to 100 mL of a phosphate buffer in which [H2PO4-] = [HPO42-] = 0.35 M?

Correct AnswerverifiedShow Answer

A 10.0-mL sample of 0.75 M CH3CH2COOH is titrated with 0.30 M NaOH. What is the pH of the solution after 22.0 mL of NaOH have been added to the acid? Ka = 1.3 × 10-5

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

A solution is prepared by adding 500 mL of 0.3 M NaClO to 500 mL of 0.4 M HClO. What is the pH of this solution?

Correct AnswerverifiedShow Answer

A 20.0-mL sample of 0.25 M HNO3 is titrated with 0.15 M NaOH. What is the pH of the solution after 30.0 mL of NaOH have been added to the acid?

Correct AnswerverifiedShow Answer

Increasing the concentrations of the components of a buffer solution will increase the buffer range.

Correct AnswerverifiedShow Answer

What is the maximum mass of KCl that can be added to1.0 L of a 0.010 M lead(II) chloride solution without causing any precipitation of lead(II) chloride? Assume that addition of KCl does not affect the solution volume. For lead(II) chloride, Ksp = 1.6 × 10-5.

Correct AnswerverifiedShow Answer

A formic acid buffer containing 0.50 M HCOOH and 0.50 M HCOONa has a pH of 3.77. What will the pH be after 0.010 mol of NaOH has been added to 100.0 mL of the buffer?

Correct AnswerverifiedShow Answer

A 50.0-mL sample of 0.50 M HCl is titrated with 0.50 M NaOH. What is the pH of the solution after 28.0 mL of NaOH have been added to the acid?

Correct AnswerverifiedShow Answer

What is the [H3O+] in a solution that consists of 0.15 M C2N2H8 (ethylene diamine) and 0.35 C2N2H9Cl? Kb = 4.7 × 10-4

Correct AnswerverifiedShow Answer

An acetic acid buffer containing 0.50 M CH3COOH and 0.50 M CH3COONa has a pH of 4.74. What will the pH be after 0.0020 mol of HCl has been added to 100.0 mL of the buffer?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

A CH3COOH/CH3COO- buffer can be produced by adding a strong acid to a solution of CH3COO- ions.

Correct AnswerverifiedShow Answer

A 25.0-mL sample of 1.00 M NH₃ is titrated with 0.15 M HCl. What is the pH of the solution after 15.00 mL of acid have been added to the ammonia solution? K_b = 1.8 × 10^-5

Correct Answer
verified

What will be the effect of adding 0.5 mL of 0.1 M HCl to 100 mL of a phosphate buffer in which [H₂PO₄^-] = [HPO₄^2-] = 0.35 M?

Correct Answer
verified

A 10.0-mL sample of 0.75 M CH₃CH₂COOH is titrated with 0.30 M NaOH. What is the pH of the solution after 22.0 mL of NaOH have been added to the acid? K_a = 1.3 × 10^-5

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

A 20.0-mL sample of 0.25 M HNO₃ is titrated with 0.15 M NaOH. What is the pH of the solution after 30.0 mL of NaOH have been added to the acid?

Correct Answer
verified

Correct Answer
verified

What is the maximum mass of KCl that can be added to1.0 L of a 0.010 M lead(II) chloride solution without causing any precipitation of lead(II) chloride? Assume that addition of KCl does not affect the solution volume. For lead(II) chloride, K_sp = 1.6 × 10^-5.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

What is the [H₃O⁺] in a solution that consists of 0.15 M C₂N₂H₈ (ethylene diamine) and 0.35 C₂N₂H₉Cl? K_b = 4.7 × 10^-4

Correct Answer
verified

An acetic acid buffer containing 0.50 M CH₃COOH and 0.50 M CH₃COONa has a pH of 4.74. What will the pH be after 0.0020 mol of HCl has been added to 100.0 mL of the buffer?

Correct Answer
verified

Correct Answer
verified

A CH₃COOH/CH₃COO- buffer can be produced by adding a strong acid to a solution of CH₃COO- ions.

Correct Answer
verified