Intro- Chemistry

Question

Calculate either [H3O+] or [OH−] for each of the solutions at 25 °C.

Answer 1

At 25^oC, K_w = 1.00 x 10^-14 = [H₃O⁺] [OH^-] from the equilibrium in water, 2 H₂O ⇔ H₃O⁺ + OH^-

since [H₃O⁺] = [OH^-] , we could "let x = [H₃O⁺] which equals [OH^-], so 1.00 x 10^-14 = x²; x = 1.00 x 10^-7 M