1A) The maximum amount of copper(II) sulfide that will dissolve in a 0.139 M cop

Question

1A) The maximum amount of copper(II) sulfide that will dissolve in a 0.139 M copper(II) acetate solution is ? M.

1B) The molar solubility of silver chromate in a 0.258 M sodium chromate solution is ? M.

1C) When 25.0 mL of a 2.74×10-4 M copper(II) nitrate solution is combined with 25.0 mL of a 4.11×10-4 M sodium hydroxidesolution does a precipitate form?  (yes or no)
For these conditions what is the Reaction Quotient, Q, equal to?

1D) When 18.0 mL of a 8.11×10-4 M lead nitrate solution is combined with 18.0 mL of a 2.32×10-4 M sodium chloride solution does a precipitate form?  (yes or no)
For these conditions what is the Reaction Quotient, Q, equal to?

Explanation / Answer

A)

CuS ------------> Cu+2   +   S2-

Ksp = [Cu+2][S2-]

6.3×10–26 = 0.139 x S

S = 4.53 x 10^-25 M

The maximum amount = 4.53 x 10^-25 M

1B)

Ag2CrO4   -------------> 2 Ag+    +   CrO42-

Ksp = [Ag+]^2 [CrO42-]

1.12×10–12 = (2S)^2 x 0.258

S = 1.04 x 10^-6 M

molar solubility = 1.04 x 10^-6 M

1C)

concentration of Cu+2 = 25 x 2.74 x 10^-4 / 25 + 25

                                   = 1.37 x 10^-4 M

concentration of OH- = 25 x 4.11 x 10^-4 / 50

                                 = 2.06 x 10^-4 M

Cu(OH)2 -------------> Cu+2   +   2 OH-

Qsp = [Cu+2][OH-]^2

       = (1.37 x 10^-4)(2.06 x 10^-4)^2

Q = 5.79 x 10^-12

Ksp = 1.1×10–15

Ksp < Q . so precipitate will form

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