1.

K_w=1 times 10^-14 at 25^@C Justify that statement.

Answer»

Solution :(i) Experimentally found that the concentration of `H_3O^+` in pure water is `1 times 10^-7` at `25^@C`.
(ii) SINCE the dissociation of water PRODUCES equal number of `H_3O^+ and OH^-`, the concentration of `OH^-` is also equal to `1 times 10^-7` at `25^@C`.
(ii) `therefore` The IONIC PRODUCT of water at `25^@C` is
`K_w=[H_3O^+][OH^-]`
`=[1 times 10^-7][1 times 10^-7]`
`K_w=[1 times 10^-14]`


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