Deck 18: Solubility and Complex-Ion Equilibria

Question 1

A saturated solution of silver iodide has a concentration of 9.1 × 10^-9 M.What is K_sp of this compound?

A)9.1 × 10^-18
B)9.1 × 10^-3
C)9.1² × 10^-3
D)(2 × 9.2 × 10^-3)²
E)(9.1 × 10^-9)²

Answer 1

(9.1 × 10^-9)²

Question 2

A small amount of solid calcium hydroxide is shaken vigorously in a test tube almost full of water until no further change occurs and most of the solid settles out.The resulting solution is:

A)concentrated and saturated
B)dilute and saturated
C)dilute and unsaturated
D)dilute and supersaturated
E)concentrated and supersaturated

Answer 2

dilute and saturated

Question 3

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

Answer 3

False

Question 4

The solubility of CaF₂ is 0.00021 mole per liter.What is the solubility product constant for CaF₂?

A)7.3 × 10^-12
B)3.7 × 10^-11
C)8.5 × 10^-8
D)4.4 × 10^-8
E)1.9 × 10^-11

Question 5

The solubility of magnesium fluoride is 1.17 × 10^-3 M.Find the value of K_sp for this compound.

A)1.17 × 10^-3
B)(1.17 × 10^-3)²
C)4(1.17 × 10^-3)³
D)(1.17 × 10^-3)³
E)3(1.17 × 10^-3)³

Question 6

The solubility of a salt MX₂ with a molar mass of 114 g/mol is 3.42 g/L.Calculate K_sp.

A)2.70 × 10^-5
B)1.08 × 10^-4
C)9.00 × 10^-4
D)2.25 × 10^-4
E)6.75 × 10^-8

Question 7

What is the molar solubility of barium carbonate in pure water? (K_sp = 5.1 × 10^-9)

A)5.1 × 10^-9 M
B)7.1 × 10^-5 M
C)1.1 × 10^-3 M
D)1.7 × 10^-3 M
E)2.6 × 10^-17 M

Question 8

The common ion effect is a case of Hess's law.

Question 9

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

Question 10

The diverse ion effect is also called the salt effect.

Question 11

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?

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 12

The solubility product constant of Li₃PO₄ is 3.2 × 10^-9.What is the molar solubility of Li₃PO₄ in water?

A)3.3 × 10^-3 M
B)9.3 × 10^-4 M
C)7.5 × 10^-3 M
D)1.5 × 10^-3 M
E)5.7 × 10^-5 M

Question 13

The molar solubility of SrSO₄ (K_sp = 7.6 × 10^-7)is:

A)2.8 × 10^-5 M
B)7.6 × 10^-7 M
C)8.7 × 10^-8 M
D)8.7 × 10^-4 M
E)9.1 × 10^-3 M

Question 14

Qualitative cation analysis has been replaced in recent years by instrumental analysis.

Question 15

If Q_sp is larger than K_sp,precipitation should occur.

Question 16

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

Question 17

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

Question 18

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

Question 19

The solubility of cerium iodate,Ce(IO₃)₃,molar mass = 664.83 g/mol,in pure water is 124 mg per 100 mL of water.Calculate the solubility product constant for cerium iodate.

A)4.9 × 10^-19
B)2.6 × 10^-14
C)8.6 × 10^-15
D)3.3 × 10^-10
E)3.5 × 10^-18

Question 20

The solubility of copper(II)iodate Cu(IO₃)₂ is reported as 0.12 g per 100 mL.What is the solubility product constant for this salt?

A)9.8 × 10^-8
B)8.6 × 10^-7
C)7.3 × 10^-6
D)6.4 × 10^-5
E)1.2 × 10^-4

Question 21

Which of the following reduces the solubility of calcium fluoride?

A)presence of "uncommon ions" such as Na⁺ and Cl^-
B)formation of the ion-pair CaF⁺
C)formation of the complex ion CaF₄^2-
D)decreasing the pH
E)cooling the solution

Question 22

The K_sp of AgCl is 1.7 × 10^-10.How many moles of MnCl₂ can be dissolved in one liter of an aqueous solution in which [AgNO₃] = 3.4 × 10^-4 M before a precipitate appears?

A)5.0 × 10^-7 mol
B)5.8 × 10^-14 mol
C)2.4 × 10^-7 mol
D)2.0 × 10⁶ mol
E)2.5 × 10^-7 mol

Question 23

Which of the following is most soluble?

A)CuS (K_sp = 8 × 10^-37)
B)Bi₂S₃ (K_sp = 1 × 10^-70)
C)Ag₂S (K_sp = 6 × 10^-51)
D)MnS (K_sp = 7 × 10^-16)
E)PbS (K_sp = 3 × 10^-28)

Question 24

Which of the following soil additives would best reduce the concentration of dissolved Fe³⁺ in ground water?

A)lime [Ca(OH)₂]
B)saltpeter [KNO₃]
C)ferric chloride [FeCl₃]
D)ammonium nitrate
E)ammonium sulfate

Question 25

When equal volumes of the indicated aqueous solutions are mixed,precipitation should occur only for:

A)2 × 10^-5 M Ag⁺ + 2 × 10^-5 M CO₃^2-
B)2 × 10^-5 M Ca²⁺ + 2 × 10^-5 M CO₃^2-
C)2 × 10^-4 M Ca²⁺ + 2 × 10^-2 M F^-
D)2 × 10^-5 M Mg²⁺ + 2 × 10^-6 M F^-
E)2 × 10^-3 M Ba²⁺ + 2 × 10^-3 M F^-

Question 26

The solubility product constant of silver sulfate is 1.6 × 10^-5.What is the molar solubility of this compound?

A)1.6 × 10^-5 M
B)(16/2)^1/2 × 10^-2 M
C)(16/4)^1/3 × 10^-2 M
D)(16)^1/2 × 10^-3 M
E)(16/4)^2/3 × 10^-2 M

Question 27

Predict the molar solubility of the following salt in an aqueous solution that contains the given concentration of one of its ions:
BaSO₄;[SO₄^2-] = 4.3 × 10^-5 M;K_sp = 1.1 × 10^-10

A)4.7 × 10^-15 M
B)6.9 × 10^-8 M
C)8.0 × 10^-4 M
D)2.6 × 10^-6 M
E)1.6 × 10^-3 M

Question 28

When solid silver chloride is shaken with a 0.1 molar aqueous solution of potassium iodide,most of the silver chloride is converted to silver iodide.This transformation takes place because:

A)silver iodide is less soluble than silver chloride
B)I^- is a better reducing agent than Cl^-
C)I^- has a larger radius than Cl^-
D)the K_sp of AgI is larger than the K_sp of AgCl
E)potassium chloride precipitates

Question 29

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

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 30

Predict the molar solubility of the following salt in an aqueous solution that contains the given concentration of one of its ions:
AgI;[I^-] = 7.2 × 10^-6 M;K_sp = 8.5 × 10^-17

A)2.4 × 10^-11 M
B)9.2 × 10^-9 M
C)1.7 × 10^-6 M
D)2.7 × 10^-4 M
E)1.2 × 10^-11 M

Question 31

Which of the following should dissolve the smallest amount of silver sulfide per liter,assuming no complex formation?

A)0.1 M HNO₃
B)0.1 M Na₂S
C)0.1 M AgNO₃
D)0.10 M NaNO₃
E)pure water

Question 32

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

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 33

The solubility product constant of M₂CrO₄(s)is 7.11 × 10^-15.How many moles of M₂CrO₄(s)will dissolve in 744 mL of aqueous solution in which [CrO₄^2-] = 0.056 M?

A)2.7 × 10^-7 mol
B)1.8 × 10^-7 mol
C)1.2 × 10^-5 mol
D)9.0 × 10^-5 mol
E)3.6 ^× 10^-7 mol

Question 34

Which of the following is least soluble?

A)NiS (K_sp = 8 × 10^-37)
B)MnS (K_sp = 8 × 10^-16)
C)PtS (K_sp = 8 × 10^-73)
D)FeS (K_sp = 4 × 10^-19)
E)Hg₂Cl₂ (K_sp = 1.3 × 10^-18)

Question 35

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

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

Question 36

Which of the following has the largest molar solubility?

A)BaSO₄,K_sp = 1.1 × 10^-10
B)AgCl,K_sp = 1.6 × 10^-10
C)Mg(OH)₂,K_sp = 2 × 10^-11
D)Cr(OH)₂,K_sp = 6.3 × 10^-11
E)Fe(OH)₃,K_sp = 4 × 10^-38

Question 37

The solubility of a salt MX₂ with a molar mass of 170 g/mol is 12.7 g/L.Calculate the K_sp.

A)4.17 × 10^-4
B)5.58 × 10^-3
C)9.59 × 10³
D)2.23 × 10^-2
E)1.67 × 10^-3

Question 38

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?

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 39

Fe(OH)₃ is most soluble in which aqueous solution?

A)0.2 M HCl
B)0.1 M KOH
C)pure water
D)0.1 M FeCl₃
E)0.2 M CaCl₂

Question 40

Which of the following salts,each of which has a solubility product equal to 1.0 × 10^-6,has the greatest molar solubility?

A)MX
B)MX₂
C)MX₃
D)M₂X

Question 41

To a concentrated buffer of pH 9.0 was added an equal volume of an aqueous solution that was 0.20 M in each of the ions Ca²⁺,Cd²⁺,and Cu²⁺.The expected precipitate would consist of:
Salt: calcium hydroxide cadmium hydroxide copper(II)hydroxide
K_sp: 4.0 × 10^-6 2.0 × 10^-14 1.8 × 10^-19

A)only Ca(OH)₂
B)only Cd(OH)₂
C)only Cu(OH)₂
D)only Cd(OH)₂ and Cu(OH)₂
E)Ca(OH)₂,Cd(OH)₂,and Cu(OH)₂

Question 42

The solubility product constant of Mg(OH)₂ is 9.0 × 10^-12.If an aqueous solution is 0.010 M with respect to Mg²⁺ ion,the amount of [OH^-] required to start the precipitation of Mg(OH)₂(s)is:

A)1.5 × 10^-7 M
B)3.0 × 10^-5 M
C)3.0 × 10^-7 M
D)9.0 × 10^-10 M
E)1.5 × 10^-5 M

Question 43

In which of the following one molar aqueous solutions would you expect cadmium sulfide,CdS,to be the most soluble?

A)NaCl
B)HCl
C)NaOH
D)C₂H₅OH
E)KOH

Question 44

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)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 45

If iron(III)acetate is added to be 1 × 10^-10 M in an aqueous solution that is 0.10 M NH₃,what is Q_sp and will Fe(OH)₃ precipitate? The K_sp of Fe(OH)₃(s)is 4 × 10^-38 and K_b for NH₃ is 1.8 × 10^-5.

A)1.3 × 10^-13,yes
B)1.7 × 10^-16,yes
C)1.7 × 10^-16,no
D)2.4 × 10^-19,yes
E)2.4 × 10^-19,no

Question 46

An aqueous solution contains [Ba²⁺] = 5.0 × 10^-5 M,[Ag⁺] = 3.0 × 10^-5 M,and [Zn²⁺] = 2.0 × 10^-7 M.Sodium oxalate is slowly added so that [C₂O₄^2-] increases.
Salt BaC₂O₄ ZnC₂O₄ Ag₂C₂O₄
K_sp 1.5 × 10^-8 1.35 × 10^-9 1.1 × 10^-11
What is the concentration of the first cation to precipitate when the second cation just begins to precipitate?

A)1.3 × 10^-6 M
B)2.2 × 10^-6 M
C)5.0 × 10^-5 M
D)1.35 × 10^-9 M
E)1.1 × 10^-11 M

Question 47

To a saturated aqueous solution of barium carbonate is added just enough sodium sulfate to achieve a maximum sulfate concentration without precipitation of barium sulfate.If no complexes form and the "salt effect" is negligible,what is the concentration of the sulfate ion in this solution? [K_sp for barium carbonate is 1.6 × 10^-9;K_sp for barium sulfate is 7.9 × 10^-11]

A)2.8 × 10^-5 M
B)6.7 × 10^-6 M
C)2.0 × 10^-6 M
D)4.0 × 10^-5 M
E)8.9 × 10^-5 M

Question 48

When 100 mL each of 2.0 × 10^-5 M Ca²⁺(aq)and 2.0 × 10^-3 M CO₃^2-(aq)are mixed,what is the remaining Ca²⁺(aq)ion concentration and is precipitation complete? The solubility product constant of CaCO₃(s)is 2.8 × 10^-9.

A)2.8 × 10^-6 M,no
B)1.0 × 10^-3 M,no
C)6.9 × 10^-5 M,no
D)2.8 × 10^-3 M,no
E)2.8 × 10^-6 M,yes

Question 49

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?

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 50

When 100 mL each of 2.0 × 10^-4 M Ag⁺(aq)and 2.0 × 10^-1 M CO₃^2-(aq)are mixed,what is the remaining Ag⁺(aq)ion concentration and is precipitation complete? The solubility product constant of Ag₂CO₃(s)is 8.5 × 10^-12.

A)4.2 × 10^-8 M,yes
B)2.0 × 10^-4 M,no
C)9.2 × 10^-6 M,no
D)1.0 × 10^-3 M,no
E)8.5 × 10^-9 M,yes

Question 51

If chromium(III)chloride is added to be 1 × 10^-12 M in an aqueous solution that is 0.10 M NH₃,what is Q_sp and will Cr(OH)₃(s)precipitate? The K_sp of Cr(OH)₃ is 6.3 × 10^-31 and K_b for NH₃ is 1.8 × 10^-5.

A)1.0 × 10^-16,yes
B)2.4 × 10^-23,no
C)2.2 × 10^-19,no
D)2.2 × 10^-19,yes
E)2.4 × 10^-21,yes

Question 52

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.

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 53

When 100 mL each of 2.0 × 10^-6 M Ag⁺(aq)and 2.0 × 10^-3 M Br^-(aq)are mixed,what is the remaining Ag⁺(aq)ion concentration and is precipitation complete? The solubility product constant of AgBr(s)is 5.0 × 10^-13.

A)7.1 × 10^-7 M,no
B)5.0 × 10^-10 M,yes
C)1.0 × 10^-3 M,no
D)5.0 × 10^-13 M,yes
E)2.5 × 10^-10 M,yes

Question 54

What is the concentration of free Zn²⁺(aq)if 0.020 M Zn²⁺ solution is mixed with an equal volume of 2.0 M NH₃(aq)? K_f for [Zn(NH₃)₄]²⁺ is 4.1 × 10⁸.

A)2.5 × 10^-11 M
B)2.9 × 10^-11 M
C)1.7 × 10^-10 M
D)9.6 × 10^-11 M
E)2.4 × 10^-9 M

Question 55

What is the free Cu²⁺(aq)concentration if 0.020 M Cu²⁺(aq)solution is mixed with an equal volume of 4.0 M NH₃(aq)? K_f for [Cu(NH₃)₄]²⁺ is 1.1 × 10¹³.

A)5.7 × 10^-15 M
B)2.8 × 10^-16 M
C)6.2 × 10^-17 M
D)4.5 × 10^-15 M
E)1.7 × 10^-16 M

Question 56

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

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

Question 57

When equal volumes of the indicated aqueous solutions are mixed,precipitation should occur only for:

A)2 × 10^-5 M Ag⁺ + 2 × 10^-5 M CO₃^2-
B)2 × 10^-5 M Ca²⁺ + 2 × 10^-5 M CO₃^2-
C)2 × 10^-5 M Ca²⁺ + 2 × 10^-3 M F^-
D)2 × 10^-2 M Mg²⁺ + 2 × 10^-3 M F^-
E)2 × 10^-3 M Ba²⁺ + 2 × 10^-3 M F^-

Question 58

In which of the following solutions will the concentration of dissolved silver species be the highest if solid AgNO₃ is stirred with 1.00 L of solution?

A)1.00 M NH₃(aq)
B)1.00 M NaOH
C)1.00 M Na₂SO₄(aq)
D)1.00 M NaCl(aq)
E)1.00 M NaC₂H₃O₂(aq)

Question 59

When equal volumes of the indicated aqueous solutions are mixed,precipitation should occur only for:

A)2 × 10^-5 M Ag⁺ + 2 × 10^-5 M CO₃^2-
B)2 × 10^-4 M Ca²⁺ + 2 × 10^-4 M CO₃^2-
C)2 × 10^-5 M Ca²⁺ + 2 × 10^-3 M F^-
D)2 × 10^-5 M Mg²⁺ + 2 × 10^-6 M F^-
E)2 × 10^-3 M Ba²⁺ + 2 × 10^-3 M F^-

Question 60

What is the approximate concentration of free Fe³⁺(aq)ion in a solution prepared by mixing equal volumes of 0.06 M Fe³⁺(aq)and 4.0 M F^-(aq)solutions? [The net formation constant for FeF₅(H₂O)^2- is 2.0 × 10¹⁵.]

A)2.8 × 10^-23 M
B)6.7 × 10^-21 M
C)6.9 × 10^-19 M
D)4.0 × 10^-15 M
E)8.9 × 10^-10 M

Question 61

Equal volumes of 0.020 M Ag⁺(aq)solution and 2.0 M NH₃(aq)solution are mixed.K_f for [Ag(NH₃)₂]⁺ is 1.6 × 10⁷.If trisodium arsenate is added so that the arsenate ion concentration is 0.10 M,will silver arsenate precipitate?
What is Q_sp? K_sp for silver arsenate is 1.0 × 10^-22.

A)no,Q_sp = 6.3 × 10^-9
B)no,Q_sp = 1.9 × 10^-29
C)yes,Q_sp = 6.5 × 10^-9
D)yes,Q_sp = 4.2 × 10^-20
E)no,Q_sp = 2.6 × 10^-29

Question 62

Write the solubility product constant expression for the following salt: CoS(s).

A)[Co²⁺]²[S^2-]²
B)[Co²⁺]²[S^2-]
C)[Co²⁺][S^2-]
D)[Co²⁺][S^2-]²
E)[Co²⁺]^1/2[S^2-]

Question 63

Write the solubility product constant expression for the following salt: Ca(OH)₂(s).

A)[Ca²⁺][OH^-]
B)[Ca²⁺]²[OH^-]
C)[Ca²⁺]³[OH^-]
D)[Ca²⁺]²[OH^-]²
E)[Ca²⁺][OH^-]²

Question 64

What molar concentration of silver ion could exist in a solution in which the concentration of CrO₄^2- is 1.0 × 10^-4 M? (K_sp of Ag₂CrO₄ = 1.1 × 10^-12)

A)9.0 × 10^-8 M
B)4.5 × 10^-3 M
C)1.0 × 10^-4 M
D)2.1 × 10^-4 M
E)7.5 × 10^-5 M

Question 65

Write the solubility product constant expression for the following salt: Ag₂SO₄(s).

A)[Ag⁺][SO₄^2-]
B)[Ag⁺]²[SO₄^2-]
C)4[Ag⁺]²[SO₄^2-]
D)[Ag⁺][SO₄^2-]²
E)[Ag⁺]²[SO₄^2-]²

Question 66

The relationship between the molar concentration of silver ion in a saturated solution of silver phosphate and the solubility product constant for silver phosphate is ________.

A)K_sp = 9[Ag⁺]³
B)K_sp = 27[Ag⁺]⁴
C)K_sp = [Ag⁺]^1/3
D)K_sp = 0.125[Ag⁺]
E)K_sp = 0.333[Ag⁺]⁴

Question 67

Choose the compound that is most soluble in water.

A)K₂S
B)HgS
C)ZnS
D)SnS
E)PbS

Question 68

At a temperature for which the solubility product constant of calcium carbonate is 4.7 × 10^-9,what mass of the salt will dissolve in 100 mL of water?

A)0.69 mg
B)0.94 mg
C)1.2 mg
D)2.4 mg
E)4.7 mg

Question 69

Write the solubility product constant expression for the following salt: PbC₂O₄(s).

A)[Pb²⁺][C₂O₄^2-]
B)[Pb²⁺]²[C₂O₄^2-]
C)[Pb²⁺]²[C₂O₄^2-]²
D)[Pb²⁺][C₂O₄^2-]²
E)4[Pb²⁺][C₂O₄^2-]

Question 70

What is the composition of the precipitate formed when H₂S gas is bubbled through 1.0 litre of a solution of 0.010 M Zn²⁺,0.010 M Pb²⁺,and 0.010 M Mn²⁺,buffered at pH 2.0,until 0.10 mol of H₂S has been added?
(K_sp values are: ZnS: 1.6 × 10^-23;MnS: 7.0 × 10^-16;PbS: 7.0 × 10^-29.For H₂S,K_a1 = 1.0 × 10^-7;K_a2 = 1.3 × 10^{-13 )}.

A)only ZnS
B)only MnS
C)only PbS
D)only MnS and PbS
E)only ZnS and PbS

Question 71

The solubility product constant of PbI₂(s)is 7.1 × 10^-9.How many moles of PbI₂ will precipitate if 250 mL of a 0.200 M solution of NaI(aq)are added to 150 mL of 0.100 M solution of Pb(NO₃)₂(aq)? You may neglect hydrolysis.

A)0.050 mol
B)1.3 × 10^-5 mol
C)0.015 mol
D)5.6 × 10^-3 mol
E)0.040 mol

Question 72

A concentrated buffer of pH 8.0 is added to an equal volume of an aqueous solution that is 0.080 M in each of the ions Zn²⁺,Ni²⁺,and Mn²⁺.The expected precipitate would consist of ________.

A)Zn(OH)₂,Ni(OH)₂ and Mn(OH)₂
B)Ni(OH)₂ and Mn(OH)₂
C)Mn(OH)₂
D)Ni(OH)₂ and Zn(OH)₂
E)Zn(OH)₂

Question 73

Write the solubility product constant expression for the following salt: Ca₃(PO₄)₂(s).

A)[Ca²⁺][PO₄^3-]
B)[Ca²⁺]²[PO₄^3-]³
C)[Ca²⁺]³[PO₄^3-]²
D)[Ca²⁺]²[PO₄^3-]
E)[Ca²⁺][PO₄^3-]₂

Question 74

Write the solubility product constant expression for the following salt: Na₂CO₃(s).

A)[Na⁺][CO₃^2-]
B)[Na⁺][CO₃^2-]²
C)[Na⁺]²[CO₃^2-]²
D)[Na⁺]²[CO₃^2-]
E)4[Na⁺]²[CO₃^2-]

Question 75

When 200 mL of 0.10 M BaCl₂(aq)is added to 100 mL of 0.30 M Na₂SO₄(aq),the number of moles of BaSO₄ (solubility product = 1.1 × 10^-10)precipitated is ________.

A)0.020 mol
B)0.010 mol
C)0.20 mol
D)0.030 mol
E)0.10 mol

Question 76

What is the minimum concentration of CN^-(aq)that will prevent the precipitation of AgX(s)from a solution that is 0.149 M in X^-(aq)and 0.0184 M in Ag⁺(aq)?
(K_sp for AgX(s)= 5.2 × 10^-17;K_f for Ag(CN)₂^- = 5.6 × 10¹⁸)

A)3.1 × 10^-3 M
B)9.4 × 10^-6 M
C)1.8 × 10^-10 M
D)1.2 × 10^-3 M
E)9.6 × 10^-3 M

Question 77

Consider an aqueous solution which is 0.020 M in Pb²⁺ and 0.20 M in Ag⁺.If concentrated aqueous potassium iodide solution (so that volume changes may be neglected)is added gradually with good stirring to this solution,which precipitate will form first?
K_sp for PbI₂ = 7.1 × 10^-9;for AgI = 8.31 × 10^-17

A)PbI₂
B)KI
C)AgI
D)PbI₂ and AgI precipitate together
E)Ag₂[PbI₄]

Question 78

Write the solubility product constant for KAl(SO₄)₂(s)?

A)([K⁺] × [Al³⁺] × 2[SO₄^2-]/[KAl(SO₄)₂])
B)([K⁺] × [Al³⁺] × [SO₄^2-]/[KAl(SO₄)₂])
C)([K⁺] × [Al³⁺] × [SO₄^2-])
D)([K⁺] × [Al³⁺] × [SO₄^2-]²)
E)none of these

Question 79

What is the concentration of Ca²⁺ in ppm (mg/L)in cave water saturated with calcite (calcium carbonate,K_sp = 4.7 × 10^-9)?

A)7.5 ppm
B)6.9 ppm
C)5.0 ppm
D)3.8 ppm
E)2.7 ppm

Question 80

The following table lists five compounds and their Ksp value.Which is least soluble?

A)ZnS
B)TlBr
C)AgCl
D)FeS
E)CuI