The solubility of `CuS` in pure water at `25^(@)C` is `3.3 xx 10^(-4)g L^(-1)`. Calculate `K_(sp)` of `CuS`. The accurate value of `K_(sp)` of `CuS` was found to be `8.5 xx 10^(-36)` at `25^(@)C`.

Explanation

To calculate the solubility product constant (\(K_{sp}\)) of \(CuS\) from its solubility in pure water, we can follow these steps:

### Step 1: Write the dissociation equation for \(CuS\)
The dissociation of \(CuS\) in water can be represented as:
\[ CuS (s) \rightleftharpoons Cu^{2+} (aq) + S^{2-} (aq) \]

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