Write the chemical formula of ammonium chloride. Explain why an aqueous solution of ammonium chloride is acidic in nature? Illustrate your answer with the help of a chemical equation.

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Solution

The chemical formula of ammonium chloride is $N H_{4} C l$
Since ammonium chloride is the salt of a strong acid HCl and weak base $N H_{4} O H$ , so an aqueous solution of ammonium chloride is acidic in nature.
When dissolved in water it gets hydrolysed to some extent to form HCl and $N H_{4} O H$ . HCL being a strong acid is fully ionized and gives a large number of hydrogen ions whereas $N H_{4} O H$ is slightly ionised so $N H_{4} C l$ solution contains more of hydrogen ions than hydroxide ions and is hence acidic in nature.

$N H_{4} C l (s) + H_{2} O (I) ⟶ N H_{4} O H (a q) + H C l (a q)$

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