Calculate the pH of a solution that has a hydroxide ion concentration, [OH−] , of 8.30×10−5 M.

Answer 1

Hello!

So if you have a solution that contains a strong base like hydroxide, we can figure out the pH by first finding the pOH using this equation:

pOH = -log [OH^-]

pOH = -log(8.30 x 10^-5)

pOH = 4.08

Okay so we got our pOH so now lets figure out the pH and with this equation:

pH + pOH = 14

pH + 4.08 = 14

pH = 9.92

Now does our answer makes sense? Well our answer above 7 which we expect for a solution that contains hydroxide. Hope this helps!