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Question

Explain the following :
(i) When NaCl is added to AgNO3 solution, a white precipitate is formed.
(ii) An aqueous solution of ammonium chloride is acidic in nature.

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Solution

(i) The silver nitrate test that there was an anion present in the solution, that will cause silver cations to precipitate silver usually as halides. Here, it precipitates as chlorides,
AgNO3+NaClAgCl+NaNO3
white aqueous precipitate
(ii) When ammonium chloride is dissolved in water, it gives an acidic solution because ammonium ion is a strong conjugate acid of the weak base ammonia, but chloride ion is weak conjugate base of the strong acid hydrochloric acid.

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