# Vitamin C coursework help

1. Nov 30, 2008

### xXAznGurlXx

Hello there, I just needed help on this following problem, its a biology coursework i am doing and it states that,
The 1% vitamin C Solution contains 1mg of vitamin c in 1.0cm3. Calculate the mass of vitamin c that is required to decolourise 1cm3 of the DCPIP solution. then use this value to work out how much vitamin c each of the fruit juices contain, in mgcm-3

So far I have tested all my fruit juices using my burette and I have recorded the volumes that is needed to decolourise the DCPIP. my writeup is almost complete except for this problem that is asking me to do.

But one thing is i don't understand the question above is asking me

2. Nov 30, 2008

### Staff: Mentor

Do you know what chemical reaction takes place in your solution? This is a stoichiometry problem, you should start with the reaction equation.

3. Nov 30, 2008

### xXAznGurlXx

well I had a test tube and inside was 1cm3 of DCIPIP and my burette contained orange juice and had to slowly add drop by drop to the dcipip until it change colour.
I have to repeat the exact same procedure with grapefruit juice, blackcurrent juice, and a wide range of juices.

4. Nov 30, 2008

### Staff: Mentor

You are referring to the procedure. I am asking what chemicals do you mix and how do they react.

5. Nov 30, 2008

### xXAznGurlXx

There were no chemicals involved, it's just those 2 solutions and when they react, it turned from blue to pinkish colour.
I mixed the orange juice with the DCPIP and then it changed colour.

6. Nov 30, 2008

### Staff: Mentor

Every single thing you deal with in your life is made of chemicals. You are made of chemicals - proteins, fat, water, carbohydrates, nucleic acids and mineral salts. Both your solutions were full of chemicals.

DCPIP is one of chemicals involved. You have already named another one earlier.

7. Dec 1, 2008

### xXAznGurlXx

So what do you suggest I should do into calculating the mass?

8. Dec 1, 2008

### Staff: Mentor

See my first post in the thread.