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Question
Explain the following:
(i) When NaCl is added to the AgNO3 solution, a white precipitate is formed.
(ii) An aqueous solution of ammonium chloride is acidic in nature.
Solution
(i)
When NaCl is added to AgNO3, a white precipitate of AgCl is formed due to the combination of Cl– ions from NaCl with Ag+ ions from AgNO3.
\[\ce{AgNO3 ⇌ Ag+ + NO3-}\]
\[\ce{NaCl ⇌ Na+ + Cl-}\]
\[\ce{Ag+ + Cl- -> \underset{\text{White ppt.(Silver chloride)}}{AgCl ↓}}\]
(ii)
An aqueous solution of ammonium chloride is acidic in nature due to hydrolysis.
\[\ce{NH4+ + Cl- + H2O ⇌ NH4OH + H+ + Cl-}\] Or
\[\ce{NH4+ + H2O ⇌ NH4OH + H+}\]
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