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Old Apr 12th 2017, 06:58 PM   #1
Sona
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a buffer reated problem

Calculate the H30 + (hydronium ion) concentration
for a buffer solution of 2 M phosphonic
acid and 1.5 M potassium hydrogen phosphate
[Ka1= 7.11* 10^-3; Ka2=6.32x10^-8].

I found this problem.
Firstly I feel that phosphonic acid is wrongly written, it should be phosphoric acid.
Assumimng it as phosphoric acid I caculated pH form the equation
pH=1/2(pKa1 + pKa2 + log [HPO4-2]/[H3PO4] ), here [HPO4-2]= 1.2M and [H3PO4]=2M
from this pH I calculated [H+].

Is this the write approach to sole this problem? please help
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