What is the concentration of OH- for a solution with a pH of 8.5?

Answer 1

First get the pOH.

pOH + pH = 14.

Therefore pOH = 14 - pH

So pOH = 14 - 8.5 = 5.5

Now with the pOH, we can get the concentration of OH^- .

[OH-] = 10^-pOH = 10^-5.5 = 3.16 x 10^-6

Answer 2

Hello, Greg,

If pH=8.5, then pOH = 5.5 (14 - 8.5 = 5.5)

pOH is the negative log of the [OH^-] concentration.

[OH^-] = 10^-5.5

[OH^-] = 3.16 x10^-6 M

Bob