FDA Vinegar / Acetic Acid Analysis
Objective- Determine the Acetic acid level contained within the vinegar sample
Background- Per the FDA regulation which states that consumer vinegar may contain no less than four percent and no more than five percent Acetic Acid, we will determine the Acetic Acid content of a sample of the vinegar in question through titration. After standardization of our titrant, which in this case will be NaOH, we will use this along with the indicator Phenolphthalein, to titrate the vinegar to determine the concentration of Acetic Acid in the sample.
Equipment and reagents- We will use a 50mL beaker, a graduated buret, spatula, droplet applicator, 125mL Erlenmeyer flask, hot plate, and a container of …show more content…
M1 NaOH= nNaOHVNaOH= 4.9×10-4mols 4.7mL=10.4×10-5 2. M2 NaOH= nNaOHVNaOH= 4.9×10-4mols 5.0mL=9.8×10-5 3. M3 NaOH= nNaOHVNaOH= 4.9×10-4mols 5.0mL=9.8×10-5
Mavg NaOH= M1×M2×M33=1.0×10-4M
Titration of vinegar nNaOH= Mavg NaOH × VNaOH 1. n1 NaOH= 1.0×10-4M8.8 mL=8.8×10-4m 2. n2 NaOH= 1.0×10-4M8.5 mL=8.5×10-4m 3. n3 NaOH= 1.0×10-4M8.2 mL=8.2×10-4m nCH3COOH= nNaOH Mass of CH3COOH= nCH3COOH ×60gmol 1. Mass of CH3COOH= 8.8×10-4m ×60gmol = 5.28×10-2g 2. Mass of CH3COOH= 8.5×10-4m ×60gmol = 5.08×10-2g 3. Mass of CH3COOH= 8.2×10-4m ×60gmol = 4.9×10-2g
Percent Weight CH3COOH in Vinegar = Mass of CH3COOHMass of Vinegar 1. Mass of CH3COOHMass of Vinegar = 5.28×10-2g1.004gmol ×100=5.26% 2. Mass of CH3COOHMass of Vinegar = 5.10×10-2g1.004gmol ×100=5.08% 3. Mass of CH3COOHMass of Vinegar = 4.9×10-2g1.004gmol ×100=4.91%
Avg % Wght CH3COOH in Vinegar = Mass1+Mass2+Mass33= 5.26+5.08+4.913= 5.08%
Results- The results of this examination is that the content percentage of Acetic Acid in the provided vinegar sample exceeds the FDA standards by .08 percent. While this clearly shows a result outside the provided guidelines, it is possible that the chance of error built into this method of testing could account for the excess. For instance, if there were an air bubble in the tip of the Buret during the titration, this would lead to the assumption of a higher level of NaOH needed to neutralize
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Procedure: I used a ruler, thermometer, and scale to take measurements. I used a graduated cylinder, short step pipet, scale, and ruler to determine volume and density. I used a volumetric flask, graduated pipet, pipet bulb, scale, and glass beaker to determine concentrations and densities of various dilutions.
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For this experiment, we used three different types of vinegar (distilled white, white wine, and champagne) to test the acetic acid within each. Our experiment was aimed to test the amount of acetic acid within each type of vinegar and compare it to the amount listed on each bottle. Our research question was, what type of vinegar contains the most acetic acid? The phenolphthalein indicator turned a light pink color to indicate when the acidic solution turned neutral due to the addition of titrant. The goal of this experiment was to test the acetic acid within each bottle to see if our data matched the value listed on the bottle.
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