What is the reactant concentration, [HA], in a reaction such as HA ⇌ H⁺ + A^- , when K = 0.21 and [H⁺] = 0.13 M?

Name: What is the reactant concentration, [HA], in a reaction such as HA ⇌ H + + A - , when K = 0.21 and [H + ] = 0.13 M?
Brand: Quizplus
Rating: 4.7 (58 reviews)

Question

Quizplus · Accepted Answer

The equilibrium constant expression for the reaction is K = [H⁺][A⁻]/[HA]. Given K = 0.21 and [H⁺] = 0.13 M, assume [A⁻] = [H⁺] = 0.13 M. Solving for [HA], [HA] = [H⁺]²/K = (0.13)²/0.21 = 0.080 M.

What Is the Reactant Concentration, [HA], in a Reaction Such