Calculate the p H of the diprotic acid H2 A (such as H2 SO4) where the dissociation of the first H is strong and the dissociation of the second H is weak but the 5% rule does not apply (K2 is too large relative to the initial concentration of H Aminus). Step 1: H2 A + H2 O →  H Aminus + H3 Oplus where K1 is large Step 2: H Aminus + H2 O ⇌  A2 minus + H3Oplus K2 = 0.013 Assume the initial concentration of H2A is 0.0107 M. Hint: The H3 Oplus concentration is not zero when setting up your I C E table for step 2 and be sure to consider the total molarity of H3 Oplus when calculating the p H.

Calculate the p H of the diprotic acid H₂ A (such as H₂ SO₄) where the dissociation of the first H is strong and the dissociation of the second H is weak but the 5% rule does not apply (K₂ is too large relative to the initial concentration of H A^minus).

Step 1: H₂ A + H₂ O →  H A^minus + H₃ O^plus where K₁ is large

Step 2: H A^minus + H₂ O ⇌  A^{2 minus} + H₃O^plus K₂ = 0.013

Assume the initial concentration of H₂A is 0.0107 M.

Hint: The H₃ O^plus concentration is not zero when setting up your I C E table for step 2 and be sure to consider the total molarity of H₃ O^plus when calculating the p H.