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Q.

A solution contains 0.01M Zn+2 and 0.01M Cu+2 ions. The solution is saturated by passing H2S gas in the solution. The sulphide ion concentration is 8.1 × 10–21M. KSP for ZnS and CuS are 3 × 10–22 and 8 × 10–36 respectively. which of the following will occur in solution

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a

CuS gets precipitated

b

ZnS get precipitated

c

Both Cu+2 and Zn+2 ions remain in the solution

d

Both CuS and ZnS get precipitated

answer is A.

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Detailed Solution

detailed_solution_thumbnail

Determining the ionic product of ZnS

[Zn+2] [S-2] = 10-2 x 8.1 x 10-21 = 8.1 x 10-23

KIP < Ksp ⇒ precipitation will not occur.

Determining the ionic product of CuS

[Cu+2] [S-2] = 10-2 x 8.1 x 10-21 = 8.1 x 10-23

KIP > Ksp ⇒ precipitation will  occur.

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A solution contains 0.01M Zn+2 and 0.01M Cu+2 ions. The solution is saturated by passing H2S gas in the solution. The sulphide ion concentration is 8.1 × 10–21M. KSP for ZnS and CuS are 3 × 10–22 and 8 × 10–36 respectively. which of the following will occur in solution