Solubility                    Quiz #1                        Solubility and Saturated Solutions

1.         To determine the solubility of solute in water, a solution must be prepared that is:

A.        saturated

B.        unsaturated

C.        concentrated

D.        supersaturated

2.         From the list of salts below, how many are considered soluble at 25oC?

CuCl2               CaSO4              PbS                  Ag3PO4

A.        zero

B.        one      (Copper II chloride is soluble)

C.        two

D.        three

3.         Which one of the following equilibrium systems is described by Ksp?

A.        CaCO3(s) CaO(s) + CO2(g)

B.        CaCO3(s) Ca2+(aq) + CO32- (aq)

C.        Ca 2+(aq) + CO32- (aq) CaCO3(s)

D.        Ca(OH)2(aq) + H2CO3(aq) CaCO3(s) + 2H2O(l)

4.         In a saturated solution, the rate of dissolving is

A.        equal to zero

B.        equal to the rate of crystallization

C.        less than the rate of crystallization

D.        greater than the rate of crystallization

5.         A soluble magnesium salt is

A.        MgSO3

B.        MgCO3

C.        Mg(NO3)2

D.        Mg3(PO4)2

6.         The equation that represents the equilibrium in a saturated solution of Fe2(SO4)3 is

A.        Fe2(SO4)3(s) 3Fe2+(aq) + 2SO42-(aq)

B.        Fe2(SO4)3(s) 2Fe2+(aq) + 3SO42-(aq)

C.        Fe2(SO4)3(s) 3Fe3+(aq) + 2SO42-(aq)

D.        Fe2(SO4)3(s) 2Fe3+(aq) + 3SO42-(aq)

7.         Which one of the following salts is soluble?

A.        BaSO4

B.        CaCO3

C.        K3PO4

D.        Fe(OH)2

8.         The equation representing the equilibrium in a saturated solution of CaSO4 is

A.        CaSO4(s) Ca2+(aq) + SO42-(aq)

B.        CaSO4(s) Ca2+(aq) + S2-(aq) + 4O2-(aq)

C.        CaSO4(s)  + H2O(l) CaO(aq) + H2SO4(aq)

D.        CaSO4(s)  + 2H2O(l) Ca(OH)2(aq) + H2SO4(aq)

9.         Which of the following units is commonly used to describe solubility?

A.        mL/s

B.        g/oC

C.        mol/L

D.        oC/mol

10.       Which of the following represents the equilibrium in a saturated solution of Cr2(SO4)3

A.        Cr2(SO4)3(s) Cr2+(aq) + SO43-(aq)

B.        Cr2(SO4)3(s) Cr3+(aq) + SO42-(aq)

C.        Cr2(SO4)3(s) 2Cr2+(aq) + 3SO43-(aq)

D.        Cr2(SO4)3(s) 2Cr3+(aq) + 3SO42-(aq)

11.       Which condition is essential to prepare a saturated solution of an ionic salt?

A.        excess solute

B.        any amount of solute

C.        a temperature of 25 0C

D.        a fixed volume of solvent

12.       Which compound will have the greatest solubility?

A.        CoS

B.        CuS

C.        FeS

D.        MgS

13.       Which compound will have the lowest solubility?

A.        Na2S

B.        Sr(OH)2

C.        CaSO4

D.        MgS

14.       The solubility of a solute is best determined from which type of solution?

A.        a saturated solution

B.        any solution at 25 0C

C.        an unsaturated solution

D.        a supersaturated solution

15.       Which compound will have the lowest solubility?

A.        BeS

B.        FeS

C.        H2S

D.        CsS

16.       Which of the solutes below is both ionic and most soluble?

A.        RbOH

B.        CH3OH

C.        Ca(OH)2

D.        Fe(OH)3

17.       Which of the solutes below is molecular?

A.        RbOH

B.        CH3OH

C.        Ca(OH)2

D.        Fe(OH)3

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

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.       Which of the solutes below can form an ionic solution with the highest conductivity?

A.        PbS

B.        CHCl3

C.        NaNO3

D.        CHCOOH

20.       Which of the following would form a saturated solution when 0.010 mol of the solid solute

is added to 100. mL of water?

A.        BaCO3

B.        FeSO4

C.        NaCN

D.        Pb(NO3)2

21.       Which of the following would best describe the solubility of a solute?

A.        litres per gram

B.        moles per litre

C.        grams per mole

D.        grams per second

22.       Which of the following solutes will produce a molecular solution?

A.        HCl

B.        FeS

C.        NaCl

D.        CH3OH

23.       Which of the following would have low solubility?

A.        SrCO3

B.        FeSO4

C.        KCN

D.        Pb(NO3)2

24.       What is the [Cl-] when 1.50 g of NaCl is dissolved in enough water to make 1000. mL of solution?

A.        0.0150 M

B.        0.0390 M

C         0.0256 M

D         0.390 M

25.       What is the concentration of the ions in 3.0 L of 1.0 M Al2(CO3)3 ?

[Al3+]               [CO32-]

A.        0.33 M             0.50 M

B.        0.66 M             1.0 M

C.        2.0 M              3.0 M

D.        3.0 M               4.5 M

26.       What is the concentration of the ions 6.0 moles Al2(CO3)3 in 3.0 L of solution?

[Al3+]               [CO32-]

A.        12. M               18. M

B.        2.0 M               3.0 M

C.        1.5 M               1.5 M

D.        4.0 M              6.0 M