Determine the pH during the titration of 71.3 mL of 0.425 M formic acid (Ka = 1.8×10-4) by 0.425 M NaOH at the following

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Determine the pH during the titrationof 71.3 mLof 0.425 M formicacid (Ka = 1.8×10-4)by 0.425 M NaOH atthe following points.(a) Before the addition of any NaOH(b) After the addition of 18.0 mLof NaOH(c) At the half-equivalence point (the titrationmidpoint) (d) At the equivalence point (e) After the addition of 107 mLof NaOH