A solution when diluted with H 2 O and boiled, it gives a white precipitate. On addition of excess NH 4 Cl / NH 4 OH , the volume of precipitate decreases leaving behind a white gelatinous preci

Question

A solution when diluted with H 2 ​ O and boiled, it gives a white precipitate. On addition of excess NH 4 ​ Cl / NH 4 ​ OH , the volume of precipitate decreases leaving behind a white gelatinous precipitate. Identify the precipitate which dissolves in NH 4 ​ OH / NH 4 ​ Cl .

TestHub · Accepted Answer

A solution of Zn 2 + ion reacts with water which on boiling give white ppt. of Zn ( OH ) 2 ​ . This precipitates dissolve in excess of NH 4 ​ OH in presence of NH 4 ​ Cl because Zn ( OH ) 2 ​ on reaction with NH 4 ​ OH in presence of NH 4 ​ Cl forms tetrammine zinc (II) complex (soluble).

Chemistry - Salt Analysis Question with Solution | TestHub

Options:

Doubts & Discussion