1. When 50.0 mL of 0.50 M formic acid is titrated with 0.50 M sodium hydroxide,

Question

1. When 50.0 mL of 0.50 M formic acid is titrated with 0.50 M sodium hydroxide, calculate the pH for each of the following: Ka of formic acid = 1.8 x 10^-4
Be sure to account for volume changes at each step.

a) Before any of the titrant (NaOH solution) is added

b) After 15.0 mL of the titrant has been added

c) When half of the formic acid has been neutralized

d) At the equivalence point

e) When 75.0 mL NaOH has been added

f) Select a good indicator for this titration.

g) Describe how to prepare a buffer solution from HCO2H and NaHCO2 having a pH of 4.60.

Explanation / Answer

Here is the answer

HCOOH + NaOH ? HCOO- + Na+ + H2O

From the equation we can see that the ratio between HCOOH and NaOH is 1:1

NOTE: we need to know how many moles of HCOOH is present to start with

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