Answer to Question #92020 in General Chemistry for jimbo

Question

At 25°C, what is the hydroxide ion concentration, [OH−], in an aqueous solution with a hydrogen ion concentration of [H+]=2.7×10−7 M?

Answer 1

According to the pH concept: pH + pOH = 14, pH = -log[H⁺], and pOH = -log[OH^-].

As a result:

-log[H⁺] + -log[OH^-] = 14

[OH^-] = (1×10^-14) / [H⁺]

[OH^-] = (1×10^-14) / 2.7×10⁻⁷ M = 0.37×10⁻⁷ M

Answer: 0.37×10⁻⁷ M