Question 1

The pH of a solution may affect solubility only if the salt contains the OH- ion.

Accepted Answer

A) True 
 B)False

Question 2

The solubility product constant for iron(III)hydroxide at 22 °C is 6.0 × 10-38.What mass of this compound will dissolve in 100 mL of 0.20 M aqueous sodium hydroxide,assuming no complex formation?

Accepted Answer

A) 6 × 10-39 g 
B) 7 × 10-37 g 
C) 8 × 10-35 g 
D) 9 × 10-33 g 
E) 1 × 10-30 g 
A) 6 × 10-39 g 
B) 7 × 10-37 g 
C) 8 × 10-35 g 
D) 9 × 10-33 g 
E) 1 × 10-30 g

Question 3

In a qualitative cation analysis,the unknown ion is precipitated by HCl(aq),remains as a chloride solid in hot water,and the precipitate turns black upon addition of aqueous ammonia.The unknown ion is ________.

Accepted Answer

A) Hg22+ 
B) Pb2+ 
C) Ag+ 
D) K+ 
E) Cd2+ 
A) Hg22+ 
B) Pb2+ 
C) Ag+ 
D) K+ 
E) Cd2+

Question 4

Fractional precipitation is a method to precipitate only part of the concentration of an ion.

Accepted Answer

A) True 
 B)False

Question 5

A solute's molar solubility and its molarity are not the same in a saturated aqueous solution.

Accepted Answer

A) True 
 B)False

Question 6

Choose the compound that is most soluble in water.

Accepted Answer

A) K2S 
B) HgS 
C) ZnS 
D) SnS 
E) PbS 
A) K2S 
B) HgS 
C) ZnS 
D) SnS 
E) PbS

Question 7

What is the molar solubility of PbI2 (Ksp = 7.1 × 10-9)in 0.10 M Pb(NO3)2(aq)?

Accepted Answer

A) 1.3 × 10-4 M 
B) 2.6 × 10-3 M 
C) 7.1 × 10-8 M 
D) 2.7 × 10-4 M 
E) 2.7 × 10-5 M 
A) 1.3 × 10-4 M 
B) 2.6 × 10-3 M 
C) 7.1 × 10-8 M 
D) 2.7 × 10-4 M 
E) 2.7 × 10-5 M

Question 8

When 100 mL each of 2.0 × 10-4 M Ca2+(aq)and 2.0 × 10-2 M F-(aq)are mixed,what is the remaining Ca2+(aq)ion concentration and is precipitation complete? The solubility product constant of CaF2(s)is 5.3 × 10-9.

Accepted Answer

A) 5.6 × 10-4 M,no 
B) 1.7 × 10-8 M,yes 
C) 4.3 × 10-7 M,no 
D) 1.7 × 10-6 M,yes 
E) 5.3 × 10-5 M,no 
A) 5.6 × 10-4 M,no 
B) 1.7 × 10-8 M,yes 
C) 4.3 × 10-7 M,no 
D) 1.7 × 10-6 M,yes 
E) 5.3 × 10-5 M,no

Question 9

Some solid in a solution at equilibrium means the solution is saturated.

Accepted Answer

A) True 
 B)False

Question 10

The solubility product constant of silver bromide is 5.0 × 10-13.What is the molar solubility of this compound?

Accepted Answer

A) 5.0 × 10-13 M 
B) (50)1/2 × 10-6 M 
C) (50)1/2 × 10-7 M 
D) (5.0/2)1/2 × 10-7 M 
E) (5.0 × 10-13)2 M 
A) 5.0 × 10-13 M 
B) (50)1/2 × 10-6 M 
C) (50)1/2 × 10-7 M 
D) (5.0/2)1/2 × 10-7 M 
E) (5.0 × 10-13)2 M

Question 11

Equal volumes of a 0.020 M Zn2+(aq)solution and a 2.0 M NH3(aq)solution are mixed.Kf for [Zn(NH3)4]2+ is 4.1 × 108.If enough sodium oxalate is added to make the solution 0.10 M in oxalate,will ZnC2O4(s)precipitate? What is Qsp? Ksp ZnC2O4 = 2.7 × 10-8

Accepted Answer

A) yes,Qsp = 11 
B) yes,Qsp = 2.9 × 10-12  
C) no,Qsp = 2.9 × 10-12  
D) yes,Qsp = 2.4 × 10-9  
E) no,Qsp = 2.4 × 10-9  
A) yes,Qsp = 11 
B) yes,Qsp = 2.9 × 10-12  
C) no,Qsp = 2.9 × 10-12  
D) yes,Qsp = 2.4 × 10-9  
E) no,Qsp = 2.4 × 10-9

Question 12

What is the molar solubility of AgCl(s)in 0.10 mol L-1 NaCN(aq)if the colourless complex ion Ag(CN)2-(aq)forms? Ksp for AgCl(s)is 1.8 × 10-10 and Kf for Ag(CN)2-(aq)is 1.0 × 1021.

Accepted Answer

A) 0.050 mol L-1 
B) 0.10 mol L-1 
C) 0.20 mol L-1 
D) 0.40 mol L-1 
A) 0.050 mol L-1 
B) 0.10 mol L-1 
C) 0.20 mol L-1 
D) 0.40 mol L-1

Question 13

Saturated aqueous solutions of sodium sulfate,ammonium carbonate,and nickel (II)nitrate are mixed together.The precipitate that forms is ________.

Accepted Answer

A) nickel (II)carbonate 
B) sodium carbonate 
C) nickel (II)sulfate 
D) ammonium sulfate 
E) sodium nitrate 
A) nickel (II)carbonate 
B) sodium carbonate 
C) nickel (II)sulfate 
D) ammonium sulfate 
E) sodium nitrate

Question 14

The solubility of magnesium fluoride in water at 18 °C is tabulated as 0.0076 g per 100 mL.What is the solubility product for this salt?

Accepted Answer

A) 7.6 × 10-6  
B) 6.8 × 10-7  
C) 8.0 × 10-8  
D) 7.3 × 10-9  
E) 3.8 × 10-10  
A) 7.6 × 10-6  
B) 6.8 × 10-7  
C) 8.0 × 10-8  
D) 7.3 × 10-9  
E) 3.8 × 10-10

Question 15

Concentrated aqueous solutions of copper (I)nitrate,sodium sulfate and silver acetate are mixed together.The precipitate which forms is ________.

Accepted Answer

A) copper (I)acetate 
B) silver nitrate 
C) silver sulfate 
D) sodium acetate 
E) nothing precipitates 
A) copper (I)acetate 
B) silver nitrate 
C) silver sulfate 
D) sodium acetate 
E) nothing precipitates

Question 16

Ion pairs as a limitation to Ksp are more likely to be a problem with NaCl than with MgSO4.

Accepted Answer

A) True 
 B)False

Question 17

What is the molar solubility of manganese carbonate ( MnCO3 )in water? The solubility-product constant for MnCO3 (s)is 5.0 × 10-10 at 25 °C.

Accepted Answer

A) 2.5 × 10-10 mol L-1 
B) 1.0 × 10-9 mol L-1 
C) 9.3 mol L-1 
D) 3.2 × 10-5 mol L-1 
E) 2.2 × 10-5 mol L-1 
A) 2.5 × 10-10 mol L-1 
B) 1.0 × 10-9 mol L-1 
C) 9.3 mol L-1 
D) 3.2 × 10-5 mol L-1 
E) 2.2 × 10-5 mol L-1

Question 18

Consider an aqueous solution which is 0.020 M in Pb2+ and 0.20 M in Ag+.Concentrated aqueous potassium iodide solution (so that volume changes may be neglected)is added gradually with good stirring to this solution.Eventually the iodide ion concentration should increase enough to cause precipitation of the second ion.What will be the concentration of the ion that precipitates first when the second ion just begins to precipitate?

Accepted Answer

A) 2.0 × 10-17 M 
B) 1.2 × 10-8 M 
C) 5.0 × 10-20 M 
D) 1.4 × 10-13 M 
E) 1.2 × 10-5 M 
A) 2.0 × 10-17 M 
B) 1.2 × 10-8 M 
C) 5.0 × 10-20 M 
D) 1.4 × 10-13 M 
E) 1.2 × 10-5 M

Question 19

What is the free Ag+(aq)concentration of 0.020 M Ag+(aq)solution mixed with an equal volume of 2.0 M NH3(aq)? Kf for [Ag(NH3)2]+ is 1.6 × 107.

Accepted Answer

A) 1.3 × 10-10 M 
B) 2.0 × 10-14 M 
C) 6.3 × 10-8 M 
D) 6.5 × 10-10 M 
E) 3.1 × 10-10 M 
A) 1.3 × 10-10 M 
B) 2.0 × 10-14 M 
C) 6.3 × 10-8 M 
D) 6.5 × 10-10 M 
E) 3.1 × 10-10 M

Question 20

A saturated solution of silver chromate has a concentration of 7.4 × 10-5 M.What is Ksp of this compound?

Accepted Answer

A) (7.4 × 10-5)2  
B) (7.4 × 10-5)3  
C) 3(7.4 × 10-5)3  
D) 7.4 × 10-5  
E) 4(7.4 × 10-5)3 
A) (7.4 × 10-5)2  
B) (7.4 × 10-5)3  
C) 3(7.4 × 10-5)3  
D) 7.4 × 10-5  
E) 4(7.4 × 10-5)3

Exam 18: Solubility and Complex-Ion Equilibria

The pH of a solution may affect solubility only if the salt contains the OH- ion.

The solubility product constant for iron(III)hydroxide at 22 °C is 6.0 × 10-38.What mass of this compound will dissolve in 100 mL of 0.20 M aqueous sodium hydroxide,assuming no complex formation?

In a qualitative cation analysis,the unknown ion is precipitated by HCl(aq),remains as a chloride solid in hot water,and the precipitate turns black upon addition of aqueous ammonia.The unknown ion is ________.

Fractional precipitation is a method to precipitate only part of the concentration of an ion.

A solute's molar solubility and its molarity are not the same in a saturated aqueous solution.

Choose the compound that is most soluble in water.

What is the molar solubility of PbI2 (Ksp = 7.1 × 10-9)in 0.10 M Pb(NO3)2(aq)?

When 100 mL each of 2.0 × 10-4 M Ca2+(aq)and 2.0 × 10-2 M F-(aq)are mixed,what is the remaining Ca2+(aq)ion concentration and is precipitation complete? The solubility product constant of CaF2(s)is 5.3 × 10-9.

Some solid in a solution at equilibrium means the solution is saturated.

The solubility product constant of silver bromide is 5.0 × 10-13.What is the molar solubility of this compound?

Equal volumes of a 0.020 M Zn2+(aq)solution and a 2.0 M NH3(aq)solution are mixed.Kf for [Zn(NH3)4]2+ is 4.1 × 108.If enough sodium oxalate is added to make the solution 0.10 M in oxalate,will ZnC2O4(s)precipitate? What is Qsp? Ksp ZnC2O4 = 2.7 × 10-8

What is the molar solubility of AgCl(s)in 0.10 mol L-1 NaCN(aq)if the colourless complex ion Ag(CN)2-(aq)forms? Ksp for AgCl(s)is 1.8 × 10-10 and Kf for Ag(CN)2-(aq)is 1.0 × 1021.

Saturated aqueous solutions of sodium sulfate,ammonium carbonate,and nickel (II)nitrate are mixed together.The precipitate that forms is ________.

The solubility of magnesium fluoride in water at 18 °C is tabulated as 0.0076 g per 100 mL.What is the solubility product for this salt?

Concentrated aqueous solutions of copper (I)nitrate,sodium sulfate and silver acetate are mixed together.The precipitate which forms is ________.

Ion pairs as a limitation to Ksp are more likely to be a problem with NaCl than with MgSO4.

What is the molar solubility of manganese carbonate ( MnCO3 )in water? The solubility-product constant for MnCO3 (s)is 5.0 × 10-10 at 25 °C.

What is the free Ag+(aq)concentration of 0.020 M Ag+(aq)solution mixed with an equal volume of 2.0 M NH3(aq)? Kf for [Ag(NH3)2]+ is 1.6 × 107.

A saturated solution of silver chromate has a concentration of 7.4 × 10-5 M.What is Ksp of this compound?

Matter: Its Properties and Measurement

Atoms and the Atomic Theory

Chemical Compounds

Chemical Reactions

Introduction to Reactions in Aqueous Solutions

Gases

Thermochemistry

Electrons in Atoms

The Periodic Table and Some Atomic Properties

Chemical Bonding I: Basic Concepts

Chemical Bonding Ii: Valence Bond and Molecular Orbital Theories

Intermolecular Forces: Liquids and Solids

Spontaneous Change: Entropy and Gibbs Energy

Solutions and Their Physical Properties

Principles of Chemical Equilibrium

Acids and Bases

Additional Aspects of Acidbase Equilibria

Electrochemistry

Chemical Kinetics

Chemistry of the Main-Group Elements I: Groups 1,2,13,and 14

Chemistry of the Main-Group Elements Ii: Groups 18,17,16,15,and Hydrogen

The Transition Elements

Complex Ions and Coordination Compounds

Nuclear Chemistry

Structures of Organic Compounds

Reactions of Organic Compounds

Chemistry of the Living State

Filters

The pH of a solution may affect solubility only if the salt contains the OH^- ion.

The solubility product constant for iron(III)hydroxide at 22 °C is 6.0 × 10^-38.What mass of this compound will dissolve in 100 mL of 0.20 M aqueous sodium hydroxide,assuming no complex formation?

What is the molar solubility of PbI₂ (K_sp = 7.1 × 10^-9)in 0.10 M Pb(NO₃)₂(aq)?

When 100 mL each of 2.0 × 10^-4 M Ca²⁺(aq)and 2.0 × 10^-2 M F^-(aq)are mixed,what is the remaining Ca²⁺(aq)ion concentration and is precipitation complete? The solubility product constant of CaF₂(s)is 5.3 × 10^-9.

The solubility product constant of silver bromide is 5.0 × 10^-13.What is the molar solubility of this compound?

Equal volumes of a 0.020 M Zn²⁺(aq)solution and a 2.0 M NH₃(aq)solution are mixed.K_f for [Zn(NH₃)₄]²⁺ is 4.1 × 10⁸.If enough sodium oxalate is added to make the solution 0.10 M in oxalate,will ZnC₂O₄(s)precipitate? What is Q_sp? K_sp ZnC₂O₄ = 2.7 × 10^-8

What is the molar solubility of AgCl(s)in 0.10 mol L^-1 NaCN(aq)if the colourless complex ion Ag(CN)₂^-(aq)forms? K_sp for AgCl(s)is 1.8 × 10^-10 and K_f for Ag(CN)₂^-(aq)is 1.0 × 10²¹.

Ion pairs as a limitation to K_sp are more likely to be a problem with NaCl than with MgSO₄.

What is the molar solubility of manganese carbonate ( MnCO₃ )in water? The solubility-product constant for MnCO₃ (s)is 5.0 × 10^-10 at 25 °C.

What is the free Ag⁺(aq)concentration of 0.020 M Ag⁺(aq)solution mixed with an equal volume of 2.0 M NH₃(aq)? K_f for [Ag(NH₃)₂]⁺ is 1.6 × 10⁷.

A saturated solution of silver chromate has a concentration of 7.4 × 10^-5 M.What is K_sp of this compound?