NCERT Class XI Chemistry Hydrogen Solutions
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Question : 34
Total: 36
Do you expect different products in solution when aluminium(III) chloride and potassium chloride are treated separately with (i) normal water (ii) acidified water, and (iii) alkaline water? Write equations wherever necessary.
Solution:
Both the compounds are salts and they react differently with water.
Aluminium (III) chloride or AlCl3 will react with water as follows :
A l C l 3 + 3 H 2 O A l ( O H ) 3 + 3 H C l
The reaction is known as hydrolysis.
(i) In normal water, both Al(OH)3 and HCl will be present.
(ii) In acidic water, Al(OH)3 will be neutralised by the acid added.
A l ( O H ) 3 + 3 H + A l 3 + + 3 H 2 O
(iii) In alkaline water, HCl will be neutralised by the alkali added.
Also, Al(OH)3 reacts to form[ A l ( O H ) 4 ] – A l O – 2
A l ( O H ) 3 + O H − [ A l ( O H ) 4 ] −
A l O 2 − + 2 H 2 O
Potassium chloride is a salt of strong acid and strong base. It will remain as such under all the conditions and will not undergo any chemical reaction.
KCl
K + + C l −
Aluminium (III) chloride or AlCl3 will react with water as follows :
The reaction is known as hydrolysis.
(i) In normal water, both Al(OH)3 and HCl will be present.
(ii) In acidic water, Al(OH)3 will be neutralised by the acid added.
(iii) In alkaline water, HCl will be neutralised by the alkali added.
Also, Al(OH)3 reacts to form
Potassium chloride is a salt of strong acid and strong base. It will remain as such under all the conditions and will not undergo any chemical reaction.
KCl
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