1.

The pH of solution obtained by mixing equal volumes of two aqueous solutions of pH 5 and pH 3 of the same substance is :

Answer»

`3.5`
`4.5`
`3.3`
4

SOLUTION :LET 100 ml of both the solutions are mixed
`[H^(+)]` in solution of pH = 5 is `10^(-5)`
`[H^(+)]` in solution of pH = 3 is `10^(-3)`
TOTAL `[H^(+)]=10^(-5)+10^(-3)`
`=1.01xx10^(-3)`
Total VOLUME = 2000 ml
Conc. in mixture
`=(1.01xx10^(-3)xx1000)/(2000)=5.05xx10^(-4)`
`pH=-log(5.05xx10^(-4))=3.3`


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