1.

10^(-6) M NaOH is diluted 100 times. The pH of the diluted base is

Answer»

Between 5 and 6
Between 6 and 7
Between 10 and 11
Between 7 and 8

Solution :`[OH^(-)]` of `10^(-6)M NaOH = 10^(-6)`.
When 100 TIMES diluted,
`[OH^(-)] = (10^(-6))/(10^(2)) = 10^(-8)`
As it is weak base, but proteolysis of water will also TAKE place. So, the contribution of `OH^(-)` ions from water must also be considered.
`:.` Total `[OH^(-)] = 10^(-8) + 10^(-7)`.


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