Calculate the concentration of an aqueous solution of Ca (OH) 2 that has a pH of 12.01. Express your answer using two significant figures.

The concentration of Ca (OH) ₂ aqueous solution of pH 12.01 is 0.0051 M

Explanation:

Because in water, the selft ionization constant of water is [H⁺][OH⁻] = 10⁻¹⁴ or pH + pOH = 14

Given pH = 12.01, so pOH = 14 - 12.01 = 1.99

The concentration of OH⁻ is 10^ (1.99) = 0.010 M

The equation is: Ca (OH) ₂ → Ca²⁺ + 2 OH⁻

So the concentration of Ca (OH) ₂ (aq) is 0.010 / 2 = 0.0050 M