Solubility        Quiz #4            Ksp to Solubility and Size of Ksp

1.         Identify the most soluble sulphide

A.        HgS,    Ksp = 1.6 x 10-54

B.        PbS,     Ksp = 7.0 x 10-29

C.        FeS,     Ksp = 3.7 x 10-19

D.        MnS,   Ksp = 2.3 x 10-13             highest ksp

2.         Saturated solutions of Na2S, CuS, SnS2, and Al2S3 are prepared at 25oC. The [S2-] will be greatest in the solution of

A.        Na2S    high solubility

B.        CuS

C.        SnS2

D.        Al2S3

3.         A solution of AgNO3 is slowly added to a mixture containing 0.10 M I-, Cl-, Br-,and IO3-.

The precipitate, which forms first, is

A.        AgI      lowest ksp

B.        AgCl

C.        AgBr

D.        AgIO3

4.         The [OH- ] is measured to be 3.3 x 10-3 mol/L in a 100 mL sample of saturated solution of Al(OH)3.

The  solubility of Al(OH)3 is

A.        1.1 x 10-4 mol/L

B.        3.3 x 10-4 mol/L

C.        1.1 x 10-3 mol/L          Do not divide by 0.100 L as it is already moles/L

D.        3.3 x 10-3 mol/L

5.         The [SO42-] in a saturated solution of PbSO4 is (Ksp = 1.1 x 10-8)

A.        1.2 x 10-16 M

B.        5.5 x 10-9 M

C.        1.1 x 10-8 M

D.        1.0 x 10-4 M                square root the ksp to get the solubility

6.         The least soluble in salt water is

A.        BaS

B.        AlCl3

C.        CaSO3 low solubility

D.        ZnSO4

7.         The solubility of AgBrO3 is

A.        2.8 x 10-9 M

B.        5.3 x 10-5 M

C.        1.1 x 10-4 M

D.        7.3 x 10-3 M                square root the ksp to get the solubility

8.         At 25oC, the solubility of Mg(OH)2 is

A.        1.1 x 10-32 M

B.        5.6 x 10-12 M

C.        2.4 x 10-6   M

D.        1.1 x 10-4 M                 4x3       =          Ksp

9.         A student evaporated 200.0 mL of a saturated solution of SrCrO4 to dryness.

The residue contained 1.2 x 10-3 mol SrCrO4. The solubility of SrCrO4 is

A.        1.4 x 10-6 M

B.        3.6 x 10-5 M

C.        2.4 x 10-4 M

D.        6.0 x 10-3 M                calculate the molarity

10.       The solubility of magnesium carbonate is

A.        9.3 x 10-5 M

B.        3.4 x 10-6 M

C.        6.8 x 10-6 M

D.        2.6 x 10-3 M                square root the ksp

11.       A saturated container of NiCO3 was evaporated to dryness. A 250.0 mL sample was found to contain 1.1 x 10-2 g NiCO3.

The molecular mass of NiCO3 is 118.7 g/mol. The molar solubility of NiCO3 is

A.        9.3 x 10-5 M

B.        3.7 x 10-4 M

C.        4.4 x 10-2 M

D.        1.4 x 10-7 M

12.       Which of the following is the least soluble in water at 25oC ?

A.        CaCO3

B.        BaSO4                         smallest ksp

C.        CuSO4

D.        MgSO4

13.       Which of the following salts has the lowest solubility?

A.        copper (I) chloride     low solubilty

B.        ammonium sulphide

C.        potassium hydroxide

D.        mercury(II) sulphate

14.       Which compound will have the lowest solubility?

A.        AgNO3

B.        AgBrO3

C.        SrSO4

D.        SrCO3             smallest ksp

15.       Which compound will have the highest solubility?

A.        FeS

B.        PbSO4

C.        CaCO3

D.        AgBrO3          greatest ksp

16.       Which compound will have the lowest solubility?

A.        MgSO4

B.        BaS

C.        SrSO4

D.        Na2CO3

17.       Which compound will have the greatest solubility?

A.        MgSO4

B.        ZnS

C.        CaSO4

D.        CaCO3

18.       Which of the following is commonly used to describe the solubility of a compound?

A.        mass of solute / moles of solute

B.        moles of solution / mass of solute

C.        mass of solute / volume of solution

D.        mass of solution / volume of solute

19.       At some temperature greater than 25 0C, the Ksp for lead (II) sulphate becomes 1.0 x 10-7.

What is the solubility of the lead (II) sulphate at this temperature?

A.        1.0 x 10-14

B.        5.0 x 10-8

C.        2.0 x 10-7

D.        3.2 x 10-4

20.       The following data was collected to determine the solubility of a substance:

Mass of solute dissolved         5.00 g

Volume of solvent                   2500.0 mL

Molar mass of solute               100.0 g/mol

Molar mass of solvent             200.g/mol

Which of the following best describes its solubility?

A.        2.00 g/L

B.        0.0500 mol

C.        0.250 mol

D.        1.00 mol/L

21.       The following data was collected to determine the solubility of a substance:

Mass of solute dissolved         500.g

Volume of solvent                   5000.0 mL

Molar mass of solute               100.0 g/mol

Molar mass of solvent             200.g/mol

Which of the following best describes its solubility?

A.        0.0200 g/mL

B.        0.0500 mol

C.        0.250 mol

D.        1.00 mol/L

22.       Which of the following is true for the salt SrF2 at 25 0C ?

A.        It has a high solubility.

B.        It will not dissolve at all.

C.        Its solubility is 0.0016 M.

D.        Its solubility is 0.0010 M.

23.       Which of the following ions could be used in the lowest concentration to remove Ag+ ions from a polluted water  sample?

A.        I-

B.        Br-

C.        BrO3-

D.        IO3-

24.       For a saturated solution, the Ksp expression does not contain any solid solute term. What is the reason for this?

A.        The solid solute is not important.

B.        The solid solute does not have a concentration.

C.        The solid solute continues to change in amount.

D.        The solid solute has a constant concentration.

25.       Which of the  following ions would have the highest concentration in 0.10 M CO32- ?

A.        Ba2+

B.        Ca2+

C.        Sr2+

D.        Mg2+