An aqueous solution of boric acid can be represented by the equilibrium system: B(OH) ₃(aq) + 2 H₂O(l) ⇌ H₃O+(aq) + B(OH) ₄^-(aq) [Ka = 5.6 × 10^-10]
What is the pH of an eyewash solution which is 0.0018 M in boric acid?

Question

Quizplus · Accepted Answer

The pH of a weak acid solution can be estimated using the formula pH = 0.5 * (pKa - log[C]), where [C] is the concentration of the acid. For boric acid, pKa = -log(Ka) = 9.25. Substituting the values, pH ≈ 0.5 * (9.25 - log(0.0018)) ≈ 6.00.

An Aqueous Solution of Boric Acid Can Be Represented by the Equilibrium