Question

As the [H+] in a solution decreases, what happens to the [OH–]?

Answer 1

As the concentration of [H+] decreases,
[OH-] increases.

Since [H+][OH-]=1E-14

Answer 2

Answer : When the concentration of
`[H^(+)] decreases the concentration of [tex] [OH^(-)] increases and so does the pH value also increases.</strong></p><p><strong>Explanation : </strong>As the concentration of [tex] H^(+)` decreases, the pH of the solution is observed to increase. The concentration of
`OH^(-)` increases with decrease of
`H^(+)` ions.

This can be related with this equation.

`[H^(+)]` +
`[OH^(-)]` =
`1X 10^(-14)`

as pH = - log
`[H^(+)]`.

It is now, clearly understood that the decrease in concentration of
`H^(+)` will increase the concentration of
`[OH^(-)]` increases with increase in pH value and makes it more basic.