Finding the vitamin C content of a lemon

RESULTS

We got separated into four groups and the results of all of the groups were in the end combined and the average was calculated. Our first result was that the indicator will change the color if we add 0.75 ml of 0.1 % C vitamin solution to it.

We know that 100 ml of the solution contains 0.1 g of vitamin C so with that fact we calculated the amount of grams that can be found in 0.75 ml.  We calculated this in the following way:

This means that we have 0.75 mg of vitamin C in 0.75 ml of solution. It also means that the indicator (2ml) will turn transparent after we add 0.75 mg of vitamin C.

After that we added lemon juice to the third flask with the indicator. We continued with the addition until the indicator turned transparent. It first turned reddish and after that transparent which we needed. We found out that 2.73 ml of lemon juice is needed in order to turn the indicator transparent. We can conclude that this amount of lemon juice contains the same amount of vitamin C as our previous solution. (0.1% C vitamin solution)

We also wanted to know the amount of vitamin C in a glass of 200 ml which is the size of an average juice glass. We did this in the following way:

This means that we have 54.9 mg in an average glass of orange juice. It is also known that the average daily dosage of C vitamin for a person is 60 mg which is almost satisfied by that glass.

The results of each group and the average of the results:

Vitamin C content of a lemon

Livia Božiček

4mm