1.

`10^(-6) M NaOH` is diluted by `100` times. The `pH` of diluted base isA. Between `6` and `7`B. Between `10` and `11`C. Between `7` and `8`D. Between `5` and `6`

Answer» Correct Answer - C
After dilution, `[OH^(-)]=10^(-8)M`
or `[H^(+)]=10^(-6) M. pH` cannot be `6` because total
`[OH^(-)]=10^(-7)+10^(-8)=10^(-7)(1+.01)`
`=10^(-7)xx1.1` or `[H^(+)]=10^(-14)//(10^(-7)xx1.1)`
`9.09xx10^(-8)`
`:. pH=9-log 9.09=8-0.9546=7.0454`


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