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What Has the Most Vitamin C? (page 2)

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Tips and Tricks

  • If you experiment on more than one day, keep your cornstarch solution in the refrigerator. Shake it if the cornstarch settles.
  • If you are doing multiple trials of the same juice, do them all at the same time. Storing your juices or using a different batch made up on another day may affect your results.
  • To test grape juice, use the white kind. You can't see the color change in purple juice. Cola drinks and tomato juice are hard to test for the same reason.

Show Your Results

Put milliliters of juice in a data table like this for "Go" and "Go Easy":

Juice Milliliters
Pineapple  
Apple . . . and so on  

For "Go Far", add rows for three trials and a row for an average for each kind of juice. Also add a column showing your calculated value for the mg/ml concentration of each juice.

For all three projects, make bar graphs of the milliliters needed to make the blue disappear (on the vertical axis) by the name of the juice (on the horizontal axis). For "Go Far," use your average values from three trials to make the bar graph. Make a separate graph showing the mg/ml concentrations you calculated. Remember, when writing your conclusions, the largest milliliter counts are the juices with the least vitamin C.

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