The pH of a strong base is 12.2 at 25 degrees. what is its hydroxide-ion concentration?

[OH⁻] = 0.016

Explanation:

Given dа ta:

pH = 12.2

Hydroxide ion concentration = ?

Solution:

It is known that,

pH + pOH = 14

12.2 + pOH = 14

pOH = 14 - 12.2

pOH = 1.8

pOH = - log [OH⁻]

1.8 = - log [OH⁻]

10⁻¹°⁸ = [OH⁻]

[OH⁻] = 0.016