1.

It has been found that the pH of a 0.01 M solution of an organic acid is 4.15. The concentration of the anion of the acid is :

Answer»

`4.15`
`3.85`
`7.08xx10^(-5)`
`7.08xx10^(-4)`

Solution :The concentration of `H^(+)` ions is equal to the concentration of the anion.
`[H^(+)]//1M=[A^(-)]//1M=` ANTI log `(-pH)`
= anti log `(-4.05)`
`=7.09xx10^(-5)`
`therefore [A^(-)]=[H^(+)]=7.08xx10^(-5)`


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