alculate 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 0.0142 M.
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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 0.0142 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.
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