tion of food because of the acidity and antimicrobial acetic acid. There are man
ID: 552683 • Letter: T
Question
tion of food because of the acidity and antimicrobial acetic acid. There are many types of vinegar found at your local grocery store, including balsamic, rice, red wine, and apple cider vinegars. A titration will help you determine the concentration of acetic acid (CHyCOOH) in vinegar. The balanced equation for the titration of acetic acid in vinegar with sodium hydroxide (NaOH) is as follows CH3COOH(aq) + NaOH(aq) H20() + NaCH COO(aq) Assume you titrated a sample of vinegar using 0.145 M of sodium hydroxide. The results of this titration are shown in the following table. Table 2: Titration Data for Vinegar Titrated (mL) | 5.00 0.10 29.05 Final Volume of NaOH (mL) s acetic acid 100%.Explanation / Answer
a)
vinegar concentration
mol of acid = mol of base
M1*V1 = M2*V2
M2 = M1*V1/V2 = 0.145*(29.05-0.10) / 5 = 0.83955 M
b)
% mass of acetic acid
Assume V= 1 Liter solution = 1000 mL
0.83955 mol per liter
mass of acid = mol*MW = 0.83955*60 = 50.373 g
Mass solution = 1000*1 = 1000
% mass = 50.373 / 1000*100 = 5.0373 %
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