| | Category | CH | P05 | Titration of Vitamin C in Citrus Fruits |
| | Abstract | The experiment I am performing will involve fresh fruit juice from 4 citrus |
| | fruits: orange, grapefruit, lemon, and lime. I will measure the amount of |
| | vitamin C in each juice using a starch-iodine titration method. in this |
| | experiment, I will titrate a known amount of vitamin C then use the same |
| | starch-iodine titration to calculate the amount of vitamin C (mg) in 4 fruit |
| | juices using the formula: |
| | mg. juice vit.C/ml. titrant = mg.known vit.C/ml titrant. |
| | |
| | I will measure how much dilute iodine solution from a burette it takes to |
| | oxidize a known amount of vitamin C (250 mg. tablet dissolved in 100 ml. |
| | distilled water). This procedure will be repeated 3 times and an average |
| | calculated. The same titration will be performed 3 times on 25ml of each |
| | juice. The amount of vitamin C is then calculated, compared, and graphed. |
| | |
| | |
| | My independent variable is the type of fruit juice. The dependent variable |
| | is the amount of vitamin C. The control is the known vitamin C tablet |
| | solution. |
| | Bibliography | 1) http://www.chem4kids.com 2) |
| | http://faculty.mansfield.edu/bganong/biochemistry/vitaminc.htm. 3) Holt |
| | Chemistry (Holt, Rinehart, Winston) |