Question 1

Determine the molar solubility of PbSO4 in pure water.Ksp (PbSO4)= 1.82 × 10-8.

Accepted Answer

A)  1.82 × 10-8 M 
B)  1.35 × 10-4 M 
C)  9.1 × 10-9 M 
D)  3.31 × 10-16 M 
E)  4.48 × 10-4 M 
A)  1.82 × 10-8 M 
B)  1.35 × 10-4 M 
C)  9.1 × 10-9 M 
D)  3.31 × 10-16 M 
E)  4.48 × 10-4 M

Question 2

Sodium hypochlorite,NaOCl,is the active ingredient in household bleach.What is the concentration of hypochlorite ion if 20.00 mL of bleach requires 32.00 mL of 0.500 M HCl to reach the equivalence point?

Accepted Answer

A)  0.300 M 
B)  0.312 M 
C)  0.800 M 
D)  1.30 M 
A)  0.300 M 
B)  0.312 M 
C)  0.800 M 
D)  1.30 M

Question 3

An important buffer in the blood is a mixture of

Accepted Answer

A)  potassium chloride and hydrochloric acid. 
B)  hydrochloric acid and sodium hydroxide. 
C)  carbonic acid and bicarbonate ion. 
D)  phosphoric acid and bicarbonate ion. 
E)  acetic acid and phosphate ion. 
A)  potassium chloride and hydrochloric acid. 
B)  hydrochloric acid and sodium hydroxide. 
C)  carbonic acid and bicarbonate ion. 
D)  phosphoric acid and bicarbonate ion. 
E)  acetic acid and phosphate ion.

Question 4

A 100.0 mL sample of 0.10 M NH3 is titrated with 0.10 M HNO3.Determine the pH of the solution after the addition of 50.0 mL of HNO3.The Kb of NH3 is 1.8 × 10-5.

Accepted Answer

A)  4.74 
B)  7.78 
C)  7.05 
D)  9.26 
E)  10.34 
A)  4.74 
B)  7.78 
C)  7.05 
D)  9.26 
E)  10.34

Question 5

How many milliliters of 0.0991 M KOH are required to titrate 25.0 mL of   to the equivalence point?

Accepted Answer

A)  21.2 
B)  0.333 
C)  4.58 
D)  0.208 
E)  29.5 
A)  21.2 
B)  0.333 
C)  4.58 
D)  0.208 
E)  29.5

Question 6

Consider the Ksp values for two compounds: MZ,Ksp = 1.5 × 10-20 and
MZ2,Ksp = 1.5 × 10-20.Why don't these compounds have the same molar solubility?

Accepted Answer

These two compounds have the same solubi

Question 7

Which of the following solutions is a good buffer system?

Accepted Answer

A)  a solution that is 0.10 M NaCl and 0.10 M HCl 
B)  a solution that is 0.10 M HCN and 0.10 M LiCN 
C)  a solution that is 0.10 M LiOH and 0.10 M HNO3 
D)  a solution that is 0.10 M HNO3 and 0.10 M NaNO3 
E)  a solution that is 0.10 M HCN and 0.10 M NaBr 
A)  a solution that is 0.10 M NaCl and 0.10 M HCl 
B)  a solution that is 0.10 M HCN and 0.10 M LiCN 
C)  a solution that is 0.10 M LiOH and 0.10 M HNO3 
D)  a solution that is 0.10 M HNO3 and 0.10 M NaNO3 
E)  a solution that is 0.10 M HCN and 0.10 M NaBr

Question 8

Identify a good buffer.

Accepted Answer

A)  small amounts of both a weak acid and its conjugate acid 
B)  significant amounts of both a strong base and a strong acid 
C)  small amounts of both a strong acid and a conjugate acid 
D)  significant amounts of both a weak acid and a strong acid 
E)  significant amounts of both a weak acid and its conjugate base 
A)  small amounts of both a weak acid and its conjugate acid 
B)  significant amounts of both a strong base and a strong acid 
C)  small amounts of both a strong acid and a conjugate acid 
D)  significant amounts of both a weak acid and a strong acid 
E)  significant amounts of both a weak acid and its conjugate base

Question 9

Give the expression for the solubility product constant for SrF2.

Accepted Answer

A)    
B)    
C)  [Sr2+]2[ F⁻] 
D)  [Sr2+][F⁻]2 
E)  [Sr2+][2F⁻] 
A)    
B)    
C)  [Sr2+]2[ F⁻] 
D)  [Sr2+][F⁻]2 
E)  [Sr2+][2F⁻]

Question 10

Identify the structure for antifreeze.

Accepted Answer

A)  CH3CH2OCH2CH3 
B)  CH3OH 
C)  HOCH2CH2OH 
D)  CH3CH2OH 
E)  (CH3)2CHOH 
A)  CH3CH2OCH2CH3 
B)  CH3OH 
C)  HOCH2CH2OH 
D)  CH3CH2OH 
E)  (CH3)2CHOH

Question 11

What is the pH of a solution made by mixing 30.00 mL of 0.10 M acetic acid with 50.00 mL of 0.100 M KOH? Assume that the volumes of the solutions are additive.Ka = 1.8 × 10-5 for

Accepted Answer

A)  8.26 
B)  9.26 
C)  11.13 
D)  12.40 
A)  8.26 
B)  9.26 
C)  11.13 
D)  12.40

Question 12

What is the pH of a buffer solution that is 0.255 M in hypochlorous acid (HClO)and 0.333 M in sodium hypochlorite? The Ka of hypochlorous acid is 3.8 × 10-8.

Accepted Answer

A)  13.88 
B)  6.46 
C)  8.49 
D)  7.30 
E)  7.54 
A)  13.88 
B)  6.46 
C)  8.49 
D)  7.30 
E)  7.54

Question 13

If the pKa of HCHO2 is 3.74 and the pH of an HCHO2/NaCHO2 solution is 3.11,which of the following is TRUE?

Accepted Answer

A)  [HCHO2] 2] 
B)  [HCHO2] = [NaCHO2] 
C)  [HCHO2] 2] 
D)  [HCHO2] > [NaCHO2] 
E)  It is not possible to make a buffer of this pH from HCHO2 and NaCHO2. 
A)  [HCHO2] 2] 
B)  [HCHO2] = [NaCHO2] 
C)  [HCHO2] 2] 
D)  [HCHO2] > [NaCHO2] 
E)  It is not possible to make a buffer of this pH from HCHO2 and NaCHO2.

Question 14

A buffer solution is 0.100 M in both HC7H5O2 and KC7H5O2 and has a pH of 4.19.Which of the following pH values would you expect from the addition of a small amount of a dilute solution of a strong base?

Accepted Answer

A)  3.89 
B)  3.69 
C)  5.79 
D)  4.49 
E)  There is not enough information to determine. 
A)  3.89 
B)  3.69 
C)  5.79 
D)  4.49 
E)  There is not enough information to determine.

Question 15

A solution containing CaCl2 is mixed with a solution of Li2C2O4 to form a solution that is 2.1 × 10-5 M in calcium ion and 4.75 × 10-5 M in oxalate ion.What will happen once these solutions are mixed? Ksp (CaC2O4)= 2.3 × 10-9.

Accepted Answer

A)  A precipitate will form since Q > Ksp for calcium oxalate. 
B)  Nothing will happen since both calcium chloride and lithium oxalate are soluble compounds. 
C)  Nothing will happen since calcium oxalate is extremely soluble. 
D)  Nothing will happen since Ksp > Q for all possible precipitants. 
E)  There is not enough information to determine. 
A)  A precipitate will form since Q > Ksp for calcium oxalate. 
B)  Nothing will happen since both calcium chloride and lithium oxalate are soluble compounds. 
C)  Nothing will happen since calcium oxalate is extremely soluble. 
D)  Nothing will happen since Ksp > Q for all possible precipitants. 
E)  There is not enough information to determine.

Question 16

Explain the common ion effect with respect to molar solubility.

Accepted Answer

The common ion effect occurs when a solu

Question 17

The molar solubility of CuI is 2.26 × 10-6 M in pure water.Calculate the Ksp for CuI.

Accepted Answer

A)  5.11 × 10-12 M 
B)  4.52 × 10-6 M 
C)  1.50 × 10-3 M 
D)  4.62 × 10-17 M 
E)  1.02 × 10-11 M 
A)  5.11 × 10-12 M 
B)  4.52 × 10-6 M 
C)  1.50 × 10-3 M 
D)  4.62 × 10-17 M 
E)  1.02 × 10-11 M

Question 18

Describe what happens at neutral pH for aluminum hydroxide.

Accepted Answer

A)  Al(H2O)63+ precipitates. 
B)  Al(H2O)2(OH)4- dissolves. 
C)  Al(OH)3 precipitates. 
D)  Al precipitates. 
E)  Al dissolves. 
A)  Al(H2O)63+ precipitates. 
B)  Al(H2O)2(OH)4- dissolves. 
C)  Al(OH)3 precipitates. 
D)  Al precipitates. 
E)  Al dissolves.

Question 19

A 200.0 mL sample of 0.180 M HClO4 is titrated with 0.270 M KOH.Determine the pH of the solution after the addition of 150.0 mL of KOH.

Accepted Answer

A)  12.1 
B)  2.65 
C)  11.35 
D)  1.89 
E)  13.06 
A)  12.1 
B)  2.65 
C)  11.35 
D)  1.89 
E)  13.06

Question 20

What is the molar solubility of AgCl in 0.10 M NaCN if the colorless complex ion Ag(CN)2- forms? Ksp for AgCl is 1.8 × 10-10 and Kf for Ag(CN)2- is 1.0 × 1021.

Accepted Answer

A)  0.050 M 
B)  0.10 M 
C)  0.20 M 
D)  0.40 M 
A)  0.050 M 
B)  0.10 M 
C)  0.20 M 
D)  0.40 M

Exam 17: Aqueous Ionic Equilibrium

Determine the molar solubility of PbSO4 in pure water.Ksp (PbSO4)= 1.82 × 10-8.

Sodium hypochlorite,NaOCl,is the active ingredient in household bleach.What is the concentration of hypochlorite ion if 20.00 mL of bleach requires 32.00 mL of 0.500 M HCl to reach the equivalence point?

An important buffer in the blood is a mixture of

A 100.0 mL sample of 0.10 M NH3 is titrated with 0.10 M HNO3.Determine the pH of the solution after the addition of 50.0 mL of HNO3.The Kb of NH3 is 1.8 × 10-5.

How many milliliters of 0.0991 M KOH are required to titrate 25.0 mL of to the equivalence point?

Consider the Ksp values for two compounds: MZ,Ksp = 1.5 × 10-20 and MZ2,Ksp = 1.5 × 10-20.Why don't these compounds have the same molar solubility?

Which of the following solutions is a good buffer system?

Identify a good buffer.

Give the expression for the solubility product constant for SrF2.

Identify the structure for antifreeze.

What is the pH of a solution made by mixing 30.00 mL of 0.10 M acetic acid with 50.00 mL of 0.100 M KOH? Assume that the volumes of the solutions are additive.Ka = 1.8 × 10-5 for

What is the pH of a buffer solution that is 0.255 M in hypochlorous acid (HClO)and 0.333 M in sodium hypochlorite? The Ka of hypochlorous acid is 3.8 × 10-8.

If the pKa of HCHO2 is 3.74 and the pH of an HCHO2/NaCHO2 solution is 3.11,which of the following is TRUE?

A buffer solution is 0.100 M in both HC7H5O2 and KC7H5O2 and has a pH of 4.19.Which of the following pH values would you expect from the addition of a small amount of a dilute solution of a strong base?

A solution containing CaCl2 is mixed with a solution of Li2C2O4 to form a solution that is 2.1 × 10-5 M in calcium ion and 4.75 × 10-5 M in oxalate ion.What will happen once these solutions are mixed? Ksp (CaC2O4)= 2.3 × 10-9.

Explain the common ion effect with respect to molar solubility.

The molar solubility of CuI is 2.26 × 10-6 M in pure water.Calculate the Ksp for CuI.

Describe what happens at neutral pH for aluminum hydroxide.

A 200.0 mL sample of 0.180 M HClO4 is titrated with 0.270 M KOH.Determine the pH of the solution after the addition of 150.0 mL of KOH.

What is the molar solubility of AgCl in 0.10 M NaCN if the colorless complex ion Ag(CN)2- forms? Ksp for AgCl is 1.8 × 10-10 and Kf for Ag(CN)2- is 1.0 × 1021.

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Determine the molar solubility of PbSO₄ in pure water.K_sp (PbSO₄)= 1.82 × 10^-8.

A 100.0 mL sample of 0.10 M NH₃ is titrated with 0.10 M HNO₃.Determine the pH of the solution after the addition of 50.0 mL of HNO₃.The K_b of NH₃ is 1.8 × 10^-5.

Consider the K_sp values for two compounds: MZ,K_sp = 1.5 × 10^-2⁰ and MZ₂,K_sp = 1.5 × 10^-20.Why don't these compounds have the same molar solubility?

Give the expression for the solubility product constant for SrF₂.

What is the pH of a solution made by mixing 30.00 mL of 0.10 M acetic acid with 50.00 mL of 0.100 M KOH? Assume that the volumes of the solutions are additive.K_a = 1.8 × 10^-5for

What is the pH of a buffer solution that is 0.255 M in hypochlorous acid (HClO)and 0.333 M in sodium hypochlorite? The K_a of hypochlorous acid is 3.8 × 10^-⁸.

If the pKa of HCHO₂ is 3.74 and the pH of an HCHO₂/NaCHO₂solution is 3.11,which of the following is TRUE?

A buffer solution is 0.100 M in both HC₇H₅O₂ and KC₇H₅O₂ and has a pH of 4.19.Which of the following pH values would you expect from the addition of a small amount of a dilute solution of a strong base?

A solution containing CaCl₂ is mixed with a solution of Li₂C₂O₄ to form a solution that is 2.1 × 10^-5 M in calcium ion and 4.75 × 10^-5M in oxalate ion.What will happen once these solutions are mixed? K_sp (CaC₂O₄)= 2.3 × 10^-9.

The molar solubility of CuI is 2.26 × 10^-6 M in pure water.Calculate the K_sp for CuI.

A 200.0 mL sample of 0.180 M HClO₄ is titrated with 0.270 M KOH.Determine the pH of the solution after the addition of 150.0 mL of KOH.

What is the molar solubility of AgCl in 0.10 M NaCN if the colorless complex ion Ag(CN)₂^- forms? K_sp for AgCl is 1.8 × 10^-10 and K_f for Ag(CN)₂^- is 1.0 × 10²¹.