[OH-] when pOH = 0.76

To find [OH-], we first need to find the value of pH using the formula:

pH + pOH = 14

Since pOH = 0.76, we can rearrange the formula to find:

pH = 14 - 0.76
pH = 13.24

Now that we have the pH value, we can find [OH-] using the formula:

[OH-] = 10^(-pH)
[OH-] = 10^(-13.24)
[OH-] = 5.01 x 10^(-14)

Therefore, when pOH = 0.76, the concentration of hydroxide ions ([OH-]) is 5.01 x 10^(-14) M.