Question

Question #ef8de

Answer 1

At pH 7 the amount of acid ions is exactly equal to the amount of basic ions.

Explanation:

At pH 7 the `H^+` concentration is `10^-7`

pH is the negative log of the hydrogen ion concentration so

the antilog of # 10^-7 is 7

Kw for water is `10^-14.`

`10^-14 =( H^+ xx OH^-)/ (H^2O)`

The concentration of water `H_2O` is one. so

`10^-14 = H^+ xx OH^-`

if `H^+ = 10^-7` Then

`10^-14 = 10^-7 xx OH^-1` Dividing both sides by `10^-7`

`(10^-14)/(10^-7) =`OH# so

`10^-7 = OH^-1`

So when the `H^+` concentration is `10^-7` The `OH^-1` concentration is also `10^-7`

At pH 7 the concentration of acid and base are equal