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9.34  Do you expect different products in solution when aluminum (III) chloride and potassium chloride treated separately with (i) normal water (ii) acidified water, and (iii) alkaline water? Write equations wherever necessary. 

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  • KCl is salt of KOH(strong base) and HCl(strong acid). So it does not hydrolyze in normal water because it is neutral in nature. It just simply ionizes in water.

         KCl\rightarrow K^{+}+Cl^{-} In acidified and alkaline water they do not dissociate into ions and remains the same.

  • AlCl_{3} is the salt of a weak base  Al(OH)_{3} and HCl( strong acid).So it hydrolyzes in normal water.

                 AlCl_{3}+H_{2}O\rightarrow Al(OH)_{3}+HCl

In acidic water, there are  H^{+} ions which react with Al(OH)_{3} and form water molecule and give Al^{3+} ions. In alkaline water,  OH^{-} ions react with Al(OH)_{3}  and form [Al(OH)_{4}]^{-}and water molecules.

Al(OH)_{3}+OH^{-}\rightarrow [Al(OH)_{4}]^{-}+H_{2}O

 

 

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Rakesh

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