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Diprotic acid problem

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KansasCat7:
I am getting frustrated with this problem and was wondering if I could get some help.
What are the concentrations of HSO4-, SO42- and H+ in a .25 M KHSO4 solution given that H2SO4 is a strong acid and the Ka for HSO4- is 1.3x10-2?
Thanks...

Borek:
Have you tried anything by yourself?

Think about the problem this way: you have a 0.25M solution af weak HA- acid with Ka = 1.3e-2...

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