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Vitamin C. The objective of this project is the determination of the amount of vitamin C in drinks. The investigation helps us know which brand and which type of fruit drink contains more vitamin C.

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Introduction

Vitamin C content in drinks ????????????? By Wong Ka Kit(???) Ng Lok Hang(???) Poon Kim Fai(???) Chan Wai(??) Tsang Shun Wing(???) Submitted for participation in the Sixth Hong Kong Chemistry Olympiad for the Secondary Schools From T.W.G.Hs Mrs. Fung Wong Fung Ting College ?????????? March 2001 Presentation material: 1. VHS videotape (7 minutes video with English voice-over) The Race of Vitamin C content Hi-CVSVita Acknowledgement We would like to thank: Ms. Elic Chan, our Principal, who has shown great concern to our project; Mr. Yu, the technician, for giving us full support when we are conducting experiments; Mr. Ting, our chemistry teacher, who not only give us much advice and provide us the resources we need but also let us know how to plan and allocate our time appropriately. Abstract The objective of this project is the determination of the amount of vitamin C in drinks. The investigation helps us know which brand and which type of fruit drink contains more vitamin C. The result may give an indication to us in choosing the suitable fruit drink for ourselves. ...read more.

Middle

The dichlorophenolindophenol solution is unstable and needs to be freshly prepared each time it is used. Procedure Preparation of 2,6-dichlorophenolimdophenol solution 1. 0.4g of DCPIP was dissolved in 200cm3 of hot deionized water. 2. The solution was then filtered and made the volume up to 1.00 dm3. 3. It was then stored in a cool dark place. Standardisation of the 2,6-dichlorophenolimdophenol solution 1. 25.0cm3 of standard ascorbic acid solution (0.2gdm-3 vitamin C) was pipetted to a conical flask 2. The dye solution was titrated rapidly from a burette. 3. The end point was taken to be when the pink colouration, due to the dye, persists for 10s. Titration 1. The DCPIP solution was diluted to 1.00 dm3 of the solution. 2. The DCPIP solution by filtered using filter funnel. 3. 10.0cm3 of the sample was pipetted to a conical flask, and then diluted to 50.0 cm3. 4. DCPIP solution as a titre. 5. By titration, until the colour change from pink to blue. 6. Repeated the experiment to the ten sample of the test. Result Band-A: Hi-C Corporation Chemicals Volume (cm3) ...read more.

Conclusion

Since the cost of the each fruit juice sample is the same, so the best buy fruit drink with respect to Vitamin C content was found to be Vita orange juice. For the same type of fruit juice, Vita brand was found to have a higher Vitamin C content than that of Hi-C brand. Discussion The differences of vitamin C content between samples were very small so that the result may not be accurate if a small error, such as adding one more drop of DCPIP solution to the sample juice, was caused. The Vitamin C content of Hi-C apple juice was exceptional low with respect to other samples. This needs further investigation. Error 1. It should also be noted that the samples of different types of fruit juice have a distinct color of their own which may affect the final effect. 2. Some vitamin C in the fruit drink was oxidized by air before the experiment. Reference URL: http://www.csiro.au/crest/crestpro/cpb001.htm URL:http://www.vforyourself.com/Overview/Primer/Chemistry/c_tests.html Books 1:Name: Revised Nuffield Chemistry Options Author: Andrew Firman Publisher: Long man Group Limited - Resources Unit 9/11 The Shambles Yorks Books 2:Name: In search of more solutions (The Royal Society of Chemistry) Author: Janet Taylor Publisher: The Royal Society of Chemistry P. 1 ...read more.

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