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Oxalic acid, H2C2O4 has acid dissociation constants Ka1 = 5.9 � 10^2 and Ka2 = 6.4...

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Chemistry

Oxalic acid, H2C2O4 has acid dissociation constants Ka1 = 5.9 �10^2 and Ka2 = 6.4 � 10^5. What is the pH after 20.00 mL of 0.0500M NaOH is added to 5.00 mL of 0.2000 M H2C2O4?

The Answer is 2.8 but I don't know how to get there

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