lab 2 complete.docx - Determination of Acetic Acid Concentration in Vinegar Using Titration Pre-laboratory Question 1 Write the balanced equation for

lab 2 complete.docx - Determination of Acetic Acid...

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Determination of Acetic Acid Concentration in Vinegar Using Titration Pre-laboratory Question 1. Write the balanced equation for the neutralization of acetic acid by sodium hydroxide. CH 3 COOH (aq) + NaOH (aq) CH 3 COONa (aq) + H 2 O (l) 2. The Food and Drug Administration (FDA) mandates that all vinegar sold in the United States must have a minimum concentration of 4% acetic acid by mass. Calculate the minimum molarity of acetic acid in vinegar according to this standard. Assume the density of vinegar is the same as for water. M = mass / (molar mass x Volume) 40 g /60.04-g/mol x 1 L M = 0.666 mol/L 3. Calculate the mass of NaOH required to make 0.40 L of a 0.50 M solution 0.40 L NaOH x 0.50 mole = 0.200 moles 4. Read through the laboratory procedures and then diagram the procedures using illustrations and/or a flow chart to describe the steps. Ensure that your diagrams are labeled with quantities and descriptions. 1 ©2014, Carolina Biological Supply Company
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Place the 10mL graduated cylinder on the electronic balance. Place the 10mL graduated cylinder on the electronic balance. 1 1 Tare the balance. Tare the balance. 2 2 Dispense ~5 mL of vinegar into the graduated cylinder with a plastic pipet Dispense ~5 mL of vinegar into the graduated cylinder with a plastic pipet 3 3 Record the exact mass of the vinegar in Data Table 1 Record the exact mass of the vinegar in Data Table 1 4 4 Transfer the vinegar into the clean 25 mL Erlenmeyer flask Transfer the vinegar into the clean 25 mL Erlenmeyer flask 5 5 Add two drops of phenolphthalein to the vinegar Add two drops of phenolphthalein to the vinegar 6 6 Transfer approximately 10 mL of 1 M Sodium Hydroxide (NaOH) to the small cup. This solution wil be used to fill the syringe. Transfer approximately 10 mL of 1 M Sodium Hydroxide (NaOH) to the small cup. This solution wil be used to fill the syringe. 7 7 Fill the syringe with 1 M NaOH solution. Try to minimize the amount of air in the syringe. Fill the syringe with 1 M NaOH solution. Try to minimize the amount of air in the syringe.
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