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Expt. 4 –Det. Of Vitamin C in Processed Fruit Drinks

Expt. 4 –Det. Of Vitamin C in Processed Fruit Drinks. Expt. 4 –Det. Of Vitamin C in Processed Fruit Drinks. Aim: To determine the vitamin C content in Ribena and compare to the nutrition information stated on the bottle. Expt. 4 –Det. Of Vitamin C in Processed Fruit Drinks.

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Expt. 4 –Det. Of Vitamin C in Processed Fruit Drinks

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  1. Expt. 4 –Det. Of Vitamin C in Processed Fruit Drinks

  2. Expt. 4 –Det. Of Vitamin C in Processed Fruit Drinks • Aim: • To determine the vitamin C content in Ribena and compare to the nutrition information stated on the bottle

  3. Expt. 4 –Det. Of Vitamin C in Processed Fruit Drinks • Equation involved: (1eqt. is missing??)

  4. Expt. 4 –Det. Of Vitamin C in Processed Fruit Drinks • Theory: • Vitamin C (ascorbic acid) is often added to canned or packaged fruit drinks to enhance their nutritional value. In this experiment, wehave used back titration/direct titration??to determine the vitamin C content of a sample of fruit drink purchased from a supermarket. • - the underlying chemical principle of your method • An excess of iodine, which is generated by reacting a fixed amount of iodate(V)ions with excess iodide ions in acidic medium, oxidizes all vitamin C in the drink sample. …no more than half of a page

  5. Expt. 4 –Det. Of Vitamin C in Processed Fruit Drinks • Chemicals: • Apparatus: • Procedure: past tense and passive voice • Data and Results: • Observation: initial colour of soln, colour change…(past tense)

  6. Expt. 4 –Det. Of Vitamin C in Processed Fruit Drinks • Calculations: • -calculate the amount of vitamin C in mg/dm3

  7. Expt. 4 –Det. Of Vitamin C in Processed Fruit Drinks • Conclusion: past tense and passive voice

  8. Expt. 4 –Det. Of Vitamin C in Processed Fruit Drinks • Discussion: • -compare your result with manufacturer’s specification and state at least a reason to explain why your result is higher than the manufacturer’s specification. • -sources of error(3pts) • -improvement of accuracy of result(3pts)

  9. Expt. 4 –Det. Of Vitamin C in Processed Fruit Drinks • For your information(FYI): • -What other ingredients beside vitamin C are listed on the label of the fruit drink? • -How would you find out whether these substances would interfere with the titration experiment? • -Is the experimental value of the vitamin C content of the fruit drink more or less than the figure quoted by the manufacturer? • -Is the vitamin C content a chemical additive? Would other ingredients contribute to the vitamin C content?

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