indicator chart ?problem . (urgent)

[KnightSaber]

Hey,

Im doing "how much vitamin C in fruits"

if i add my indicator which is iodine 2% + cornstarch paste its purple...then i just add the juice.

however the problem is i want to know how many grams of vitamin C is in a specific amount of juice.

the only way i can think of is using one or those charts where there is a range or colours from light to dark showing how much so there is of something in a solution. ive done it with Ph levels before but not vitamin C.

ive searched everywhere and answer.com but nothing. i dont know what its called...an indicator chart for vitamin C ?

thanks again to those so consitent in helping me do much project right.
greatly appreciated. thanks

KnightSaber

[ahmee]

Hi KnightSaber,

Go look at the 3rd website that jessicahua gave you in the other forum which is: http://www.virtualsciencefair.org/2004/ ... /exp1.html

Then scroll down and look at #8 in the Method section:

8. Line up the tubes from lightest to darkest purple. The lighter the solution, the higher the level of Vitamin C content. That’s because Vitamin causes the purple indicator solution to lose its color.

Or you can look at the 2nd website that jessicahua gave you:
http://www.reachoutmichigan.org/funexpe ... taminc.htm

Scroll all the way down and look at the "Calculations" part. That should help you get the specific amounts of Vitamin C are in different fruit juices.

Hope this helps! Good luck! =)

[KnightSaber]

thanks but what im looking for is actually a chart that shows me the approximate amount of vitamin based on the colour of the solution.

if i was to line then all up from darkest to lightest then i would only be comparing them.

if i was to measure the amount of iodine i put in then it would wreak my experiement since it is a variable im not suppose to be changing. plus i wouldnt know how much iodine is "enough" to make a specific colour.

so therefore i need a chart.

thanks ahmee and jessicahua.

KnightSaber

[KnightSaber]

oops sry for double posting.

is it better if:

i have juice added to iodine.

or

i have iodine added to juice.

im suppose to be testing whats in the juice though....

[jessicahua]

hi!

I think you should add the juice to the indicator. According to this website: http://www.virtualsciencefair.org/2004/ ... /exp1.html in the methods 5 and 6, it says to put the indicator solution in the test tubes and then add 10 drops of juice to it.

sorry...but I wasn't able to find a chart that would show the amount of Vitamin C. However, if I find one later I will post it.

Have fun with your experiment!