5. a. A commercial vinegar is analyzed for the percent acetic acid present. The

Question

5. a. A commercial vinegar is analyzed for the percent acetic acid present. The data for Trial 1 is listed in the table below. Complete the table to determine the percent. (See Report Sheet.) Record calculated values with the correct number of significant figures. A. Preparation of Vinegar Sample 1. Mass of vinegar (g) -3.0%Part B.5 B. Analysis of Vinegar Sample 1. Buret reading, initial (mL) 2. Buret reading, final (mL) 3. Volume of NaOH used (mL) 4. Molar concentration of NaOH 3.70 25.40 Part B.6 solution (mol/L) 0.0940 5. Moles of NaOH added (mol) 6. Moles of CH,COOH in vinegar (mol) 7. Mass of CH,COOH in vinegar (g) 8. Show calculation. -Part B.7 Show calculation. Show calculation. Percent by mass of CH,COOH in vinegar (%) Show calculation. Part B.8

Explanation / Answer

3. Volume of NaOH solution = 25.40 - 3.70 = 21.7 mL

5. Moles of NaOH added = molarity * volume of solution in L = 0.0940 * 21.7 / 1000 = 0.00204 mol

6. Moles of CH3COOH = 0.00204 mol

Because, 1 mol of NaOH needs 1 mol of CH3COOH to neutralise.

7. Mass of CH3COOH = moles * molar mass = 0.00204 * 60.0 = 0.122 g.

8. % by mass of CH3COOH in vinegar = 0.122 * 100 / 3.06 = 4.00 %

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