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Calculate the pH during the titration of 20.00 mL of 0.1000 M HCOOH(aq) with 0.1000 M...

Calculate the pH during the titration of 20.00 mL of 0.1000 M HCOOH(aq) with 0.1000 M NaOH(aq) after 12 mL of the base have been added.
Ka of formic acid = 1.8 x 10-4.

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Expert Solution

millimoles of HCOOH = 20 x 0.1 = 2

millimoles of NaOH = 12 x 0.1 = 1.2

HCOOH   + NaOH ---------------------> HCOONa + H2O

2                 1.2                                      0              0

0.8             0                                        1.2

pH = pKa + log [HCOONa / HCOOH]

pH = 3.75 + log (1.2 / 0.8)

pH = 3.93

queen_honey_blossom answered 2 years ago
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