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Question

The dissociation of water at 25C is 1.9×107% and the density of water is 1.0 g/cc. The ionisation constant of water is :

A
3.42×106
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B
3.42×108
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C
1.00×1014
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D
2.00×1016
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Solution

The correct option is D 2.00×1016
The degree of dissociation (α) for water is 1.9×107100=1.9×109.

1 L of water (molecular mass =18 g/mol) weighs 1000 g.
Hence, concentration of water =100018 M.

The expression for the ionization constant of water is K=[H+][OH]=C(α)2.

Substituting values in the above expression, we get
K=100018×(1.9×109)2=2.0×1016.

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