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Calculate the pH at the following intervals if 30mL 0.20M of formic acid, HCHO2 is titrated...

Calculate the pH at the following intervals if 30mL 0.20M of formic acid, HCHO2 is titrated with 0.15M NaOH. For HCHO2 Ka = 1.8 x 10-4

a) before any NaOH has been added

b) after a total of 15.0mL of NaOH has been added

c) at the equivalence point

d) after a total of 50.0mL of NaOH has been added.

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