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Question
A 25.00-mL sample of propionic acid, HC3H5O2, of unknown concentration was titrated with 0.151 M KOH. The equivalence point was reached when 41.28 mL of base had been added. What is the hydroxide-ion concentration at the equivalence point? Ka for propionic acid is 1.3x10-5 at 25ºC.
A) 1.5 x10-9M
B) 1.0 x10-7M
C) 1.1 x10-5M
D) 8.5 x10-6M
E) 1.1 x10-3M
Answer
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