Vitamin C Lab

So today in class we did the Vitamin C lab! We started out by making a 1.00 mg/ml standard solution of vitamin c by crushing a 500 mg tablet and adding 500 ml of water. We took 20 drops of that and added in 3 drops of startch, our indicator. We added startch into the reaction because when we add iodine, we'll know the reaction is done when the solution turns dark blue. That means there is no more vitamin C solution to react with. Anyways, after the 3 drops of startch we added drops of iodine into the solution until it turned (and stayed) a dark blue. We tested pear nectar, V8, apple juice, and white grapefruit juice. 

In the end, grapefruit juice had the highest vitamin c concentration and pear nectar had the lowest.