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Calculate the pH of 0.04 M HNO3 Solution...

Calculate the pH of 0.04 M `HNO_3` Solution.

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Concentration of `HNO_3=0.04M`
`[H_3O^+]=0.04` mol dm
`pH=-log[H^3 O^+]`
`=-log(4xx10^(-2))`
=2-log4`
`=2-0.6021`
`=1.3979`
`=1.40`
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