What is the concentration of H₃O⁺ and OH^- in pure water at room temperature? A) 1.0 × 10^-14 M B) 1.0 × 10^-7 M C) 1.0 M D) 1.0 × 10⁷ M E) 1.0 × 10¹⁴ M

Question

Quizplus · Accepted Answer

The concentration of H+ and OH- in pure water at room temperature is 1.0 × 10^-7 M. This is because water auto-ionizes to a very small extent, producing equal concentrations of H+ (hydrogen ions) and OH- (hydroxide ions) that maintain a neutral pH of 7. The product of these concentrations, [H+][OH-], is the ion product constant for water, Kw, which is 1.0 × 10^-14 at 25°C. Given that the concentrations of H+ and OH- are equal in pure water, each must be 1.0 × 10^-7 M to satisfy this constant.

What Is the Concentration of H3O+ and OH- in Pure

What Is the Concentration of H₃O⁺ and OH^- in Pure