n this exercise, we determine the concentration of acetic acid in a vinegar solu
ID: 875603 • Letter: N
Question
n this exercise, we determine the concentration of acetic acid in a vinegar solution of unknown concentration by acid/base titration. We standardize the base by titratiing it with a primary standard acid, potassium hydrogen phthalate (hereafter abbreviated as KHP). Since KHP is a solid, we can make a solution with a precise acid concentration by dissolving an accurately weighed sample in a precise volume of water (using a volumetric flask). The empirical formula of KHP is KC8H5O4. Use the molar masses on the back cover of the manual to determine its molar mass.
A KHP solution was prepared as follows:
1). What is the concentration of the KHP solution? [Note: The answers to almost all the subsequent questions depend on the concentration of KHP.]
Initial weight of KHP vial (g) 19.0715 Final weight of KHP vial (g) 15.7719 Volume of KHP solution (mL) 250.0Explanation / Answer
The concentration of KHP = weight/(molar mass*volume)
= 3.3/203*0.25 = 0.065 M
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