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J-8
(4.0)
17.
(Exp G) In a titration of an acetic acid (CH3COOH) solution of unknown concentration, a 28.18 mL
sample of the acid is required 28.73 mL of a 0.2110 M KOH solution to reach the equivalence point.
a)
Determine the initial concentration of CH3COOH.
b)
What ions in significant concentrations are present in the solution at the equivalence point?
Support your answer with the appropriate balanced chemical equations.
c)
What is the concentration of the conjugate base at the equivalence point?
d)
What is the percent dissociation, given an initial pH of 2.82.
e)
Determine the pH of the solution at the equivalence point.
BONUS QUESTION
(2.0)
18.
(Exp I) Calculate the volume of 0.500 M sodium formate, NaHCOO, solution that should be mixed
with 100 mL of 0.250 M formic acid, HCOOH, to prepare a buffer solution having a pH of 3.53. (K
a
for formic acid is 2.00 x 10
-4
)
