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For the reaction : \( \mathrm{Ag}(\mathrm{CN})_{2}^{-} \rightleftharpoons \mathrm{Ag}^{+}+2 \mathrm{CN}^{-} \), the \( K_{c} \) at \( 25^{\circ} \mathrm{C} \) is \( 4 \times 10^{-19} \). Calculate \( \left[\mathrm{Ag}^{+}\right] \)in solution which was originally \( 0.1 \mathrm{M} \) in \( \mathrm{KCN} \) and \( 0.03 \mathrm{M} \) in \( \mathrm{AgNO}_{3} \).
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