3 years ago

In this video, I’ll show you the lab experiment on how to determine the acid content of the vinegar.

Vinegar is essentially an aqueous solution of acetic acid, which is a carboxylic acid. The acid
has one ionizable proton, the hydrogen from the –OH group, and it is a weak acid, with
pKa value of 1.75 x 10 -5 at 25 °C. The total acid content of vinegar can be determined by
titration with a standard base such as sodium hydroxide, using phenolphthalein as the
indicator. The principal acidic constituent is acetic acid. Although other acids are also
present, the results are reported in terms of acetic acid, which normally ranges between
4 and 6% (w/v).

The equation for the titration reaction is:
CH3COOH + NaOH → CH3COONa + H2O

The molecular mass of acetic acid is 60.05 g mol-1. Since the information on the vinegar
bottle label gives the concentration of acetic acid in w/v %, you have to convert a
concentration of acetic acid in mol /L to that in mass of acetic acid per 100 mL of vinegar.

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00:00 Introduction
00:20 Purpose
00:37 Reagents
00:47 Procedure
02:25 Lab Report
04:29 Calculations on Lab Report