If the [H+] changed from [1 x 10-7] to [1 x 10-4], what is the new [OH-]?

1 x 10-7

1 x 10-4

1 x 10-3

1 x 10-10

1 x 10^-10 M

Explanation:

We know that;

[H+][OH-] = 1 * 10^-14

Therefore;

when [H+] is 1 x 10^-7 then [OH-] will be;

= [1 * 10^-14]/[1 x 10^-7]

= 1 x 10^-7

When the [H+] changes from 1 x 10^-7 to [1 x 10-4]

then the [OH-] will change from 1 x 10^-7 to;

= [1 * 10^-14]/[1 x 10^-4]

= 1 x 10^-10 M

Thus; the new [OH] is 1 x 10^-10 M