Weak Acid and Buffer Systems Abstract

Weak Acid and Buffer Systems Abstract - Abstract: Weak Acid...

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Abstract: Weak Acid and Buffer Systems The purpose of this experiment was to titrate three acids (formic, acetic, and propionic) to calculate the equivalence point, K a , and pK a values for each. For formic acid, the amount of NaOH needed to reach the equivalence point was 50.70mL, the K a was 0.000178, and the pK a was 3.75. For acetic acid, these values were 48.35mL, 0.0000195, and 4.71, respectively. For propionic, the values were 52.75mL, 0.0000145, and 4.84. These results show that fewer hydrogen ions were removed from the propionic acid than were from the formic, because propionic acid contains three carbons, whereas formic has one. This agrees with intermolecular theory, which says that with an increase in the number of carbons in a chain of an organic acid, the propensity of the hydrogen atom to be removed decreases (the highly-electronegative oxygen is more attracted to the electrons of the carbons and does not steal the one electron from the hydrogen, liberating it and creating an acid). As supported by the results of this experiment, one
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This note was uploaded on 04/07/2008 for the course CHEM 140L taught by Professor Calhoun during the Fall '07 term at Whitman.

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Weak Acid and Buffer Systems Abstract - Abstract: Weak Acid...

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