ICSE Class 10 Chemistry
Question 69 of 69
Study of Compounds — Ammonia — Question 8
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Question Question 4.5
Give reasons for the following:
Aqueous solution of lead and zinc nitrate can be distinguished using an aqueous solution of ammonia.
A lead salt gives a chalky white ppt. on reaction with ammonium hydroxide which does not dissolve when excess of ammonium hydroxide is added.
Pb(NO3)2 + 2NH4OH ⟶ 2NH4NO3 + Pb(OH)2 ↓
On the other hand, zinc salt forms a white gelatinous ppt. which dissolves when excess of ammonium hydroxide is added. Hence, the two can be easily distinguished using an aqueous solution of ammonia.