Vegence of Chem... pH question

[sharpieLIFE]

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Does anyone know how to solve this one?

All set

 

[MedPR]

Does anyone know how to solve this one?

Calculate the pH of 0.01 M H2SeO4(aq), given that Ka1 is very large and Ka2 = 1.2 multiplied by 10-2.

What are your answer choices.

 

[regeneration]

It's 2. Since pKa1 is very large, we can assume that it deprotonates once completely. Then, pKa = [H][A-]/[HA] --> x^2/0.01 = 0.01 and x=0.01. Thus, [H] = 0.01 and pH = 2