Department of Pre-University Education, KarnatakaPUC Karnataka Science Class 12

# If the solubility product of CuS is 6 × 10−16, calculate the maximum molarity of CuS in aqueous solution. - Chemistry

#### Question

If the solubility product of CuS is 6 × 10−16, calculate the maximum molarity of CuS in aqueous solution.

#### Solution

Solubility product of CuS, Ksp = 6 × 10−16

Let s be the solubility of CuS in mol L−1.

CuS  ↔ Cu2+ + S2-

s        s

Now K_(sp) = [Cu2+][S2-]

=  sxs

=s2

Then, we have, Ksp = s2  = 6 x10-16

=> s  = sqrt(6xx10^(-16))

= 2.45 × 10−8 mol L−1

Hence, the maximum molarity of CuS in an aqueous solution is 2.45 × 10−8 mol L−1

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