What is the reactant concentration, [HA], in a reaction such as HA ⇌ H⁺ + A^- , when the K = 0.10 and [H⁺] = 0.001 M?

Question

Quizplus · Accepted Answer

The equilibrium constant expression for the reaction is:K = [H+][A-] / [HA]Substituting the given values into the expression, we get:0.10 = (0.001 M)([A-]) / [HA]Solving for [HA], we get:[HA] = (0.001 M)([A-]) / 0.10Since [H+] = [A-], we can substitute [H+] for [A-] in the above equation:[HA] = (0.001 M)(0.001 M) / 0.10[HA] = 1 × 10^-5 MTherefore, the correct answer is A.

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