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# Why is the aqueous solution of Aluminium Chloride acidic?

Last updated date: 20th Mar 2023
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Hint: Write the balanced reaction and use the nature of the products to deduce an answer.

The reaction between Aluminum Chloride and water yields Aluminium Hydroxide and Hydrochloric Acid.

The reaction is shown below-

$AlCl_{3} + 3H_{2}O \to Al(OH)_{3} \downarrow + 3HCl$

We know that $Al(OH)_{3}$ is a weak base which means it partially dissociates in the solution and also it is sparingly soluble in water and hence it precipitates whereas HCl is a strong acid and it almost completely dissociates into $H^{+}$ and $Cl^{-}$ ions.

Now since the solution contains a strong acid and weak base, it will clearly be slightly acidic in nature.

Note: Such problems can only be solved when the behaviour of the reactants and the products is known. Writing a balanced equation gives a clearer picture. One should also know what are strong and weak acids/bases and their characteristics.