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Chemistry

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

Analytical Chemistry

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Answer

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

When ammonia solution is added dropwise to zinc chloride solution, a white gelatinous ppt of zinc hydroxide is obtained.

ZnCl2colourless solution+2NH4OHZn(OH)2white gelatinous ppt+2NH4Cl\underset{\text{colourless solution}}{{\text{ZnCl}2}} + 2\text{NH}4\text{OH} \longrightarrow \underset{\text{white gelatinous ppt}}{\text{Zn(OH)}2↓} + 2\text{NH}4\text{Cl}

On adding excess of ammonia solution, the ppt dissolves and a colourless solution is obtained.

Zn(OH)2+2NH4Cl+2NH4OH[(Zn(NH3)4]Cl2Tetraamminezinc (II) sulphate+4H2O\text{Zn(OH)}2 + 2\text{NH}4\text{Cl} + 2\text{NH}4\text{OH} \longrightarrow \underset{\underset{\text{zinc (II) sulphate}}{\text{Tetraammine}}}{[(\text{Zn(NH}3)4]\text{Cl}2} + 4\text{H}_2\text{O}

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