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Finding the vitamin C content of a lemon

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________________ INTRODUCTION In our experiment we tested the amount of vitamin C in a certain amount of lemon juice. We did this with the help of PCPIP which is an indicator that shows the presence if C vitamin. For this we used the mentioned indicator, pipette, three eprouvetes, 0.1% of C vitamin solution and lemon juice. First we had to get the volume of 0.1% vitamin C solution that is needed for our amount of PCPIP (2ml) to decolorize. Then we had to determine the volume of lemon juice that is needed to decolorize the same amount PCPIP. ...read more.


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. ...read more.


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: Group Volume of 0.1% of C solution (ml) Volume of lemon juice (ml) 1 0.71 0.66 2.78 2 0.70 0.60 2.80 3 0.82 0.78 1.3 (not taken into consideration because it clearly stands out) 4 0.90 0.80 2.61 Average 0.75 2.73 Vitamin C content of a lemon Livia BožiÄek 4mm ...read more.

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