The pH of a solution KOH is 10. Calculate the hydroxyl ion concentration.

Given, pH of solution = 10

pOH of the solution = 14 – 10 = 4

Now, we know,

pOH = – log [OH ^– ]

[OH ^–] = antilog [ – pOH] = 1 * 10 ^-4

Hence total hydroxyl ion concentration in the solution is 1 * 10 ^-4 mol L^-1 .