Vitamin C Lab

The Vitamin C lab was a fun one to do. We tested 4 kinds of juice, and the purpose was to find which juice had the greatest amount of vitamin C in it. In order to determine this, we put 20 drops of each juice in a test tube, then added starch as an indicator. Then, We added an Iodine solution that we continued to add until the juice turned a dark blue color, which was the endpoint of the reaction. We tested grapefruit juice, apple juice, V8 and pear nectar, and the grapefruit juice had the greatest amount of Vitamin C. This lab connected to what we're doing in class because it served as an intro to acids and bases by having us practice how to determine endpoint and visually see the titration reactions.

http://www.dailymail.co.uk/health/article-2785621/How-grapefruit-really-help-lose-weight-Drinking-fruit-s-juice-eating-fatty-food-help-reduce-weight-fifth.html