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Formic acid has a Ka of 1.8x10^-4. calculate the pH at the following places on a...

Formic acid has a Ka of 1.8x10^-4. calculate the pH at the following places on a titration curve when 30.00 mL of 0.200 M HCOOH is titrated against 0.150 M KOH.

a. the initial pH

b. the pH at the point when 15.00 mL base has been added

c. the pH at the point when 20.00 mL base has been added

d. the pH at the equivalence point

c. the pH at the point when 50.00 mL base has been added

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