Which of the following is the most effective in causing coagulation of ferric hydroxide solution?
Which of the following is the most effective in causing
coagulation of ferric hydroxide solution?
- $KCl$
- $KNO_3$
- $K_2SO_4$
- $\mathrm{K}_3\left[\mathrm{Fe}(\mathrm{CN})_6\right]$
Solution
Ferric hydroxide solution, is a negatively charged sol.
$\begin{aligned}
& \mathrm{KCl} \rightleftarrows \mathrm{K}^{+}+\mathrm{Cl}^{-} \\
& \mathrm{KNO}_3 \rightleftarrows \mathrm{K}^{+}+\mathrm{NO}_3^{-} \\
& \mathrm{K}_2 \mathrm{SO}_4 \rightleftarrows 2 \mathrm{~K}^{+}+\mathrm{NO}_4^{2-} \\
& \mathrm{K}_3\left[\mathrm{Fe}(\mathrm{CN})_6\right] \rightleftarrows 3 \mathrm{~K}^{-}+\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{3-}
\end{aligned}$
Hence, $\mathrm{K}_3\left[\mathrm{Fe}(\mathrm{CN})_6\right]$ will be most effective in causing coagulation of ferric hydroxide solution.
Asked in: AP EAMCET 2015
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