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 [
]. Hence, it undergoes hydrolysis in normal water.
In acidified water, H+ions react with forming water and giving 
ions. Hence, in acidified water, 
will exist as 
and
ions.
In alkaline water, the following reaction takes place:
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