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Diprotic Acid Titratioin Curve

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    I have to draw a pH curve for an acid with Ka1= 1.42x10^-3 (pKa1=2.847) and Ka2=2.01x10^-6 (pKa2=5.696).

    There is a 25mL sample of 0.100M of this acid, H2A that is being titrated with 0.100M NaOH.
    The initial pH of the acid is 1.924. How do I find the pH at both equivalence points?
 
 
 
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