Standardizing a base with potassium hydrogen phthalate [ KHP, with the molecular

Question

Standardizing a base with potassium hydrogen phthalate [KHP, with the molecular formula KHC8H4O4 (s), molar mass: 204.23 g/mole] is a standard procedure (we did this in lab too). In an experiment to standardize a potassium hydroxide solution the following data were obtained:

A. What is the concentration, in molarity, of the KOH solution?

Experiment Number

Mass of KHP (grams)

Volume of KOH (mL)

1

0.4071

28.73

2

0.3987

28.13

3

0.4029

28.44

Experiment Number

Mass of KHP (grams)

Volume of KOH (mL)

1

0.4071

28.73

2

0.3987

28.13

3

0.4029

28.44

Explanation / Answer

moles of KHP = moles of KOH

molarity = moles/L of solution

Expt. No.     Mass of KHP    Vol. of KOH    moles of KHP        moles of KOH    molarity of KOH

    1                  0.4071              28.73          1.99 x 10^-3           1.97 x 10^-3             0.068         

    2                  0.3987              28.13          1.95 x 10^-3           1.97 x 10^-3            0.069

    3                  0.4029              28.44           1.97 x 10^-3           1.97 x 10^-3            0.069

So the average concentration of KOH = 0.0687 M

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