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What is the minimum \( \mathrm{pH} \) required to prevent the
P precipitation of \( \mathrm{ZnS} \) in a solution that is \( 0.01 \mathrm{M} \)

W \( \mathrm{ZnCl}_{2} \) and saturated with \( 0.10 \mathrm{M} \mathrm{H}_{2} \mathrm{~S} \) ?
\( \left(\mathrm{Ksp}\right. \) of \( \mathrm{ZnS}=10^{-21}, \mathrm{~K}_{\mathrm{a}_{1}} \times \mathrm{K}_{\mathrm{a}_{2}} \) of \( \mathrm{H}_{2} \mathrm{~S}=10^{-20} \) )
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