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Question:

Do you expect different products in solution when aluminium(III) chloride and potassium chloride treated separately with

(i) normal water

(ii) acidified water, and

(iii) alkaline water?

Write equations wherever necessary.

Answer:

Potassium chloride (KCl) is the salt of a strong acid (HCl) and strong base (KOH). Hence, it is neutral in nature and does not undergo hydrolysis in normal water. It dissociates into ions as follows:

In acidified and alkaline water, the ions do not react and remain as such.

Aluminium (III) chloride is the salt of a strong acid (HCl) and weak base [Al(OH)3]. Hence, it undergoes hydrolysis in normal water.

In acidified water, H+ions react with Al(OH)3 forming water and giving Al3+ions. Hence, in acidified water, AlCl3 will exist as Al3+(aq) and Cl-(aq) ions.


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