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17#4

What is the solubility (in grams per liter) of lead(II) chromate, PbCrO4, in 0.315 M potassium chromate, K2CrO4? The Ksp for PbCrO4 is 1.8 x 10-14.

17#5

The solubility of silver sulfate, Ag2SO4, in water has been determined to be 8.0 g/L. What is the solubility in 0.36 M sodium sulfate, Na2SO4?

17#7

Magnesium sulfate, MgSO4, is added to 508 mL of 0.016 M sodium hydroxide, NaOH, until a precipitate just forms. How many grams of magnesium sulfate were added? Assume that the volume of the solution is not changed significantly by the addition of magnesium sulfate.

17#9

The formation constant Kf for the complex ion Zn(OH)42- is 2.8 x 1015. What is the concentration of zinc ion, Zn2+, in a solution that is initially 0.41 M in Zn(OH)42-?

17#10

What is the solubility of silver oxide, in a solution buffered at pH 10.65? The equilibrium is:

Ag2O(s) + H2O(l) 2Ag+(aq) + 2OH-(aq); Kc = 2.0 x 10-8.

17#11

What must be the concentration of chromate ion in order to precipitate strontium chromate, SrCrO4, from a solution that is 0.0018 M Sr2+. Ksp for strontium chromate is 3.5 x 10-5.

17#12

How many grams of sodium sulfate can be added to 259 mL of 0.0042 M barium chloride before a precipitate forms?

17#13

Calculate the molar solubility of silver iodide, AgI, in 2.2 M NH3.

17#14

Hydrazine, N2H4, is a base that ionizes to give N2H5+ and OH- (Kb = 1.7 x 10-6). You add magnesium sulfate to a hydrazine solution. Calculate the concentration of Mg2+ ion when magnesium hydroxide, Mg(OH)2, just begins to precipitate from 0.24 M N2H4. Ksp for Mg(OH)2 is 1.8 x 10-11.

17#15

A saturated solution of lead(II) iodate in pure water has an iodate-ion concentration of 8.0 x 10-5 M. What is the molar solubility of lead(II) iodate in a 0.31 M lead(II) nitrate solution at the same temperature?

17#16

A solution contains 0.00712 M calcium ion. A concentrated sodium fluoride solution is added to precipitate calcium fluoride (assume no volume change). At what concentration of F- does precipitate start to form?

17#17

What is the molar solubility of beryllium(II) hydroxide in a solution that is 0.30 M in NH3 and 0.25 M in NH4Cl? Be(OH)2 Ksp = 2.5 x 10-18.

From the following Ho and So values predict which of reactions I, II and III would be spontaneous at 300ºC.

H (kJ) S(J/K)
I >-5.0 -15
II -10.0 +20
III -5.0 -30

From the following Ho and So values predict which of reactions I, II and III would be spontaneous at 25ºC.

H (kJ)

S(J/K)

I

+10.5

+30

II

+1.8

-113

III

-126

+84

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