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Data Data Table 1Vinegar Sample 1Vinegar Sample 2Vinegar Sample 3Mass of Vinegar4.90 g4.83 g5.00 gVolume of Vinegar mLDensity = 1.005 g/mL4.88 mL4.8 mL4.98 mLInitial NaOH volume insyringe8.9 mL9.5 mL9.0 mLFinal NaOH volume insyringe4.1 mL4.5 mL4.3 mLVolume of NaOHDelivered4.8 mL5.0 mL4.7 mLMoles of NaOH Delivered0.0048 mol0.0050 mol0.0047 molMoles of Acetic Acid inSample0.0048 mol0.0050 mol0.0047 molMass of Acetic Acid inSample0.288 g0.300 g0.282 gCalculated Molarity ofAcetic Acid in the sampledvinegar0.98 M1.0 M0.94 MCalculated Percent Massof Acetic Acid in sampledvinegar5.9 %6.2 %5.6 %AverageCalculatedPercent Mass of AceticAcid in Sampled Vinegar5.9 %Activity 2 (Titration of Apple Cider Vinegar Sample with Sodium Hydroxide)MethodActivity 2 is an inquiry-based activity to demonstrate the learned technique of determining the acetic acid concentration in vinegar to a vinegar sample from your home. Each type of vinegar has a slightly different concentration of acetic acid. This activity requires the selection of a vinegar product from your home, a friend’s home, or a local restaurant. Only about a teaspoon of 3
vinegar is needed. Attempt to find a different type of vinegar such as cider, malt, or balsamic vinegar. The vinegar included in this kit is white vinegar. Different brands of vinegar may also contain different amounts of acetic acid. Use the same procedure and data table to determine the acetic acid content in your vinegar sample. DataData Table 2Vinegar Sample 1Vinegar Sample 2Vinegar Sample 3Mass of Vinegar4.82 g4.84 g4.90 gVolume of Vinegar mLDensity = 1.005 g/mL4.80 mL4.82 mL4.88 mLInitial NaOH volume insyringe9.2 mL10.0 mL9.8 mLFinal NaOH volume insyringe5.6 mL6.2 mL5.8 mLVolume of NaOHDelivered3.6 mL3.8 mL4.0 mLMoles of NaOH Delivered0.0036 mol0.0038 mol0.0040 molMoles of Acetic Acid inSample0.0036 mol0.0038 mol0.0040 molMass of Acetic Acid inSample0.216 g0.228 g0.240 gCalculated Molarity ofAcetic Acid in the sampledvinegar0.75 M0.79 M0.82 MCalculated Percent Massof Acetic Acid in sampledvinegar4.5 %4.7 %4.9 %AverageCalculatedPercent Mass of AceticAcid in Sampled Vinegar4.7 %Activity 3 (Calculations of pKafrom Sample Lab Data)Method Review the lab data found in Data Table 3. This is from a titration of a vinegar sample using a pH meter. Determine the volume of 0.1M NaOH consumed during the titration. Record the answer and then calculate the Molarity of the Acetic Acid in the vinegar samples. Record the 4