Solubility        Quiz #5           Trial Ksp

1.        In an experiment, a student mixes equal volumes of 0.0020 M Pb2+ ions with 0.0040 M I- ions. The trial ion product is

A.          4.0 x 10-9

B.          3.2 x 10-8

C.          1.3 x 10-7

D.          8.0 x 10-6

2.        In an experiment, 20.0 ml of 0.0060 M CaCl2 and 20.0 mL of 0.0050 M NaSO4 are mixed together.

The trial ion product (trial Ksp) is

A.          7.5 x 10-6 and a precipitate will form

B.          7.5 x 10-6 and a precipitate will not form

C.          3.0 x 10-5 and a precipitate will form

D.          3.0 x 10-5 and a precipitate will not form

3.        In a saturated solution of Zn(OH)2, the [Zn2+] is

A.          less than 0.10 M

B.          more than 10.0 M

C.          more than 0.10 M but less than 1.0 M

D.          more than 1.0M but less than 10.0 M

4.        When 0.20 M Al2(SO4)3 is added to an equal volume of 0.20 M CaCl2,

A.          AlCl3 precipitates

B.          CaSO4 precipitates

C.          AlCl3 and CaSO4 precipitate

D.          no precipitate forms

5.        When a student mixes equal volumes of 0.20 M Na2S and 0.02 M Sr(OH)2.

A.          no precipitate forms

B.          a precipitate of only SrS forms

C.          a precipitate of only NaOH forms

D.          precipitates of both NaOH and SrS form

6.        When solutions of Pb(NO3)2 and NaCl are mixed, the trial ion product (Trial Ksp)

is 9.8 x 10-6. Which of the following statements is true?

A.          A precipitate forms because Ksp > 9.8 x 10-6

B.          A precipitate forms because Ksp < 9.8 x 10-6

C.          A precipitate does not form because Ksp < 9.8 x 10-6

D.          A precipitate does not form because Ksp > 9.8 x 10-6

7.        When equal volumes of 0.060 M AgNO3 and 0.00090 M NaBrO3 are mixed, the trial ion product (TIP) is

A.          less than Ksp and a precipitate forms

B.          greater than Ksp and a precipitate forms

C.          less than Ksp and no precipitate forms

D.          greater than Ksp and no precipitate forms

8.        The mixture that could produce a precipitate of two compounds is

A.          0.2 M HgSO4 and 0.2 M FeCl2

B.          0.2 M AgNO3 and 0.2 MgCl2

C.          0.2 M K2CO3 and 0.2 CuSO4

D.          0.2 M ZnSO4 and 0.2 Ba(OH)2

9.        Which of the following has a solubility of less than 0.10 M?

A.          SrS

B.          SrCl2

C.          SrSO4

D.          Sr(OH)2

10.      When equal volumes of 2.0 M Pb(NO3)2 and 2.0 M KCl are mixed

A.          a precipitate forms because trial ion product < Ksp

B.          a precipitate forms because trial ion product > Ksp

C.          a precipitate does not form because trial ion product < Ksp

D.          a precipitate does not form because trial ion product > Ksp

11.      A solution is found to have an initial [Pb2+] of 0.0066 M and a [Br-] of

0.00050 M. What will be observed as the ions interact?

Observation                 Reason

A.          precipitate                   Trial Ksp > Ksp

B.          precipitate                   Trial Ksp < Ksp

C.          no precipitate              Trial Ksp > Ksp

D.          no precipitate              Trial Ksp < Ksp

12.      A solution is found to have an initial [Pb2+] of 0.066 M and a [Br-] of

0.050 M. What will be observed as the ions interact?

Observation                 Reason

A.          precipitate                   Trial Ksp > Ksp

B.          precipitate                   Trial Ksp < Ksp

C.          no precipitate              Trial Ksp > Ksp

D.          no precipitate              Trial Ksp < Ksp

13.      A solution is found to have an initial [Pb2+] of 0.00264 M and a [Br-] of

0.050 M. What will be observed as the ions interact?

Observation                 Reason

A.          precipitate                   Trial Ksp > Ksp

B.          precipitate                   Trial Ksp = Ksp

C.          no precipitate              Trial Ksp > Ksp

D.          no precipitate              Trial Ksp = Ksp

14.       What happens when equal volumes of 0.40 M BaCl2 and 0.40 M Pb(NO3)2 are mixed?

A.        Only PbCl2 precipitates.

B.        Only Ba(NO3)2 precipitates.

C.        Both PbCl2 and Ba(NO3)2 precipitate.

D.        No precipitate forms.

15.       Which of the ions below could be used in a precipitation reaction to determine the [SO42-] in a water sample?

A.        H+

B.        Cs+

C.        Sr2+

D.        NH4+

16.       Two salt solutions were mixed and a Trial Ksp was calculated to be

4.4 x 10-12.  The Ksp value is 5.6 x 10-13.  From this information, which of the following is a true statement?

Ksp comparison          Outcome

A.        Trial Ksp < Ksp          precipitate forms

B.        Trial Ksp > Ksp          precipitate forms

C.        Trial Ksp < Ksp          no precipitate forms

D.        Trial Ksp > Ksp          no precipitate forms

17.       Two salt solutions were mixed and a Trial Ksp was calculated to be

8.4 x 10-14.  The Ksp value is 5.6 x 10-13.  From this information, which of the following is a true statement?

Ksp comparison          Outcome

A.        Trial Ksp < Ksp          precipitate forms

B.        Trial Ksp > Ksp          precipitate forms

C.        Trial Ksp < Ksp          no precipitate forms

D.        Trial Ksp > Ksp          no precipitate forms

18.       When equal volumes of 0.40 M NaOH and 0.40 M CaS are mixed together,

A.        a precipitate forms and the Trial Ksp would be less than Ksp.

B.        no precipitate forms and the Trial Ksp would be less than Ksp.

C.        a precipitate forms and the Trial Ksp would be greater than Ksp.

D.        no precipitate forms and the Trial Ksp would be greater than Ksp.

19.       When equal volumes of 0.00020 M NaOH and 0.00020 M MgS are mixed   together,

A.        a precipitate forms and the Trial Ksp is less than Ksp.

B.        no precipitate forms and the Trial Ksp is less than Ksp.

C.        a precipitate forms and the Trial Ksp is greater than Ksp.

D.        no precipitate forms and the Trial Ksp is greater than Ksp.

20.       When equal volumes of 0.00040 M NaOH and 0.00040 M MgS are mixed   together,

A.        a precipitate forms and the Trial Ksp is less than Ksp.

B.        no precipitate forms and the Trial Ksp is less than Ksp.

C.        a precipitate forms and the Trial Ksp is greater than Ksp.

D.        no precipitate forms and the Trial Ksp is greater than Ksp.