Question

When a certain powder is mixed into a solution of silver nitrate, a white precipitate forms. When the powder is added to a solution of sodium hydroxide, bubbles form, which produce a noxious odor. These bubbles, when bubbled into a solution of nickel (II) hydroxide, produce a drastic color change from green to dark blue. What is the identity of this powder?

Answer 1

Answer:

Ammonium chloride

Explanation:

The powder is:- Ammonium chloride

When mixed with silver nitrate, white prescipitate of silver chloride is formed as:-

$NH_4Cl+AgNO_3\rightarrow NH_4NO_3+AgCl$

When mixed with sodium hydroxide, ammonia gas is formed which has noxious order.

$NH_4Cl +NaOH\rightarrow NH_3 + H_2O + NaCl$

Ammonia gas on reaction with nickel (II) hydroxide forms deep blue colored complex as shown below:-

$Ni(OH)_2(s) + 6NH_3(aq)\rightarrow [Ni(NH_3)_6]^{2+}(aq) + 2OH^{-}(aq)$