Calculate the pH of a 0.020 M carbonic acid solution,H₂CO₃₍_aq_),that has the stepwise dissociation constants K_a1 = 4.3 × 10^-7 and K_a2 = 5.6 × 10^-11. A) 1.70 B) 4.03 C) 6.37 D) 10.25

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Quizplus · Accepted Answer

The pH is primarily determined by the first dissociation constant (Ka1) since it is much larger than Ka2. Using the formula for weak acid dissociation, pH = -log(sqrt(Ka1 * [H2CO3])), we find pH ≈ 4.03.

Calculate the PH of a 0