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A 50.0 mL sample of a 0.01 M solution of...

A 50.0 mL sample of a 0.01 M solution of HCOOH was titrated with 0.10 M NaOH. Calculate the pH of the solution when 10 mL of NaOH was added. `K_(a)` for HCOOH `=1.772 xx 10^(-4)`

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