Calculate the pH of the following aqueous solutions. Choose your answer from the given pH ranges. -0.5 M NaHCO₃ (pK_a1 = 6.37; pK_a2 = 10.25) A) pH 6.00-8.99 B) pH 11.00-14.00 C) pH 9.00-10.99 D) pH 0.00-2.99 E) pH 3.00-5.99

Question

Quizplus · Accepted Answer

Sodium bicarbonate (NaHCO3) is a weak acid with two dissociation constants. The pH of a solution of NaHCO3 is determined by its first dissociation constant (pKa1 = 6.37). Since NaHCO3 acts as a buffer, the pH will be close to the pKa1 value but slightly higher due to the presence of the conjugate base (HCO3-), leading to a pH range of 6.00-8.99.

Calculate the PH of the Following Aqueous Solutions