EXPT 10:
Vitamin C Determination

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Experiment 10 - Vitamin C Determination

Postlab Questions:

Part A - Preparation of Standard Thiosulphate, S2O32-, Solution

  1. Determine the concentration of sodium thiosulphate solution in g/mL.
  2. Determine the concentration of sodium thiosulphate solution in g/L.
  3. Determine the concentration of sodium thiosulphate solution in moles/L.

Part B - Standardization of the Iodine Solution

  1. How many moles of S2O32- ions is available in the flask?
  2. Write the balanced equation for the reaction which occurs.
  3. How many moles of iodine, I2, is added in the titration?
  4. What is the volume of iodine solutioin added in the titration?
    (Note: What is the average titration volume?)
  5. What is the molarity of the iodine, I2, solution?

Part C - Vitamin C Determination in Fruit Juice

  1. How many moles of iodine, I2, is added in the titration?
  2. Write the balanced equation for the reaction which occurs.
  3. How many moles of vitamin C is available in the flask?
  4. What is the volume of fruit juice used?
  5. How many moles of vitamin C is in 100 mL of the fruit juice?
  6. How many milligrams of vitamin C is in 100 mL of the fruit juice?

 

 



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