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ICSE Class 10 Chemistry Question 4 of 10

Analytical Chemistry — Question 1

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Question 1

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

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+2NH4OH⟶Zn(OH)2↓white 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}