Question

Name the chloride of a metal which is soluble in excess of ammonium hydroxide. Write equation for the same.

Answer 1

Zinc chloride (ZnCl2) is soluble in excess of ammonium hydroxide.

$ZnC{I}_2+2N{H}_{4}OH⟶Zn(OH{)}_2\downarrow +2N{H}_{4}CI$

With an excess of $N{H}_{4}OH$ ppt dissolves

$Zn(OH{)}_2+2N{H}_{4}CI+2N{H}_{4}OH(excess)⟶[Zn\left(N{H}_3{)}_4\right]C{I}_2+4H_{2}O$

$\left[Zn\right(N{H}_3{)}_4]C{I}_2$ -- Tetrammine zinc (II) Chloride (Colourless)