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Question

The value of equilibrium constant for self ionisation of water at 25 C is (density of water 1 g/ml) :

A
55.5×1018
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B
5.55×1018
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C
3.25×1018
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D
1×1018
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Solution

The correct option is C 3.25×1018
The self ionization reaction for water is:
H2O+H2OH3O++OH
Therefore equilibrium constant (K),
K=[H3O+][OH][H2O]2
The density of water is 1 g/mL.
So, [H2O]=1×100018=55.56
K=107×107(55.56)23.25×1018

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