Section: 2
Date Experiment Completed:
Complete the following table:
Preparation of the potassium iodate solution
F.W., g/mole 214.0008
mass, g 2.0639
total solution volume, mL 500.0
concentration, mole/L 0.01929
aliquot used for titration, mL 25.00
moles in aliquot 0.0004823
Complete the following table.
Note: You also may create a similar table in Excel, complete your calculations there, and then paste it below. Feel free to add columns to the table to help you with your calculations.
Calibration of the sodium thiosulfate solution
Volume of Na2S2O3 solution used for titration, mL
concentration, mol/L
Trial 1 Trial 2 Trial 3 average
39.1 31.7 30.0 33.6 2.27
Write balanced chemical reaction(s) that occur during titration. Show how you calculated the concentration of the sodium thiosulfate.
Calculations
Complete the following table.
Vitamin C Tablet mass, g:
Determination of the Ascorbic Acid
Titration mass of the ascorbic acid sample, g volume of Sodium Thiosulfate solution, mL Weight % of the Asc. Acid in the tablet
1
2
3
Write balanced chemical equation that describes the reaction of ascorbic acid. Provide a sample of calculations that you used to complete the table above. Please use your actual data as an example. One sample for each type of calculation is sufficient.
Calculations:
Concentration of I3-
Reaction 1 [ 3:1]
4. Report you final result:
Weight Percent:
Uncertainty:
