$C{H_3} \equiv CH\,\,\, + \mathop {CuC{l_2}}\limits_{{\rm{(Ammonical)}}} \to \mathop {Cu - C \equiv C - Cu}\limits_{{\rm{Red ppt}}{\rm{.}}} $
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$\begin{array}{*{20}{c}}
{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,O} \\
{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,||} \\
{C{H_3}C{H_2} - O - C - C{H_2} - C - OH} \\
{||\,\,\,\,\,} \\
{O\,\,\,\,\,\,}
\end{array}$
$Fe(OH)_{3(s)} \rightleftharpoons Fe^{3+}_{(aq)} + 3OH^-_{(aq)}$
is decreased by $1/4$ times, then equilibrium concentration of $Fe^{3+}$ will increase by.....$ times$