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Question

If the solubility product of CuS is 6×1016, calculate the maximum molarity of CuS in aqueous solution.

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Solution

Solubility product of CuS, Ksp of CuS = 6 x 10-16

If s is the solubility,

then CuS = cu2+ + S2-

Therefore KSP = { cu2+}{ S2-}

Or

KSP = s x s

Or

s = √ KSP = √6 x 10-16

= 2.45 x 10-8 M



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