Although it is a violent poison if swallowed, Mercury(II) cyanide \...

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Although it is a violent poison if swallowed, Mercury(II) cyanide \( \mathrm{Hg}(\mathrm{CN})_{2} \), has been used as a typical skin antiseptic. ( \( \mathrm{K}_{\text {sp }} \) of \( \mathrm{Hg}(\mathrm{CN})_{2}=1.35 \times 10^{-23} \), Atomic mass of \( \mathrm{Hg}=200 \mathrm{u} \) ). Assume no ion to be undergoing hydrolysis.
(b) How many milligrams of \( \mathrm{Hg}(\mathrm{CN})_{2} \) dissolve per litre of pure water ?
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