measuring amounts of vitamin c in apple juice leah bury, grade 9
TRANSCRIPT
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Measuring Amounts of Vitamin C in Apple Juice
Leah Bury, Grade 9
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• Using titration to find out which type of apple juice (from concentrate, not from concentrate) contains the most vitamin C.
• Chose this experiment in order to see if there was a significant difference between types of apple juice
Problem
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• Titration- method that uses a solution with a known concentration to find the concentration of a second solution.
• Vitamin C- apple juice is not a natural source
Research
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Hypothesis
• If two different types of apple juice differ in ingredients and/or type, then they will have different amounts of Vitamin C.
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Materials• Apple Juice (20 mL)
• Apple Juice from Concentrate (20 mL)
• Vitamin C Tablets (125 mg)
• Distilled Water
• Iodine Solution (50 mL)
• Soluble Starch (.125 g)
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Variables•Independent- type of apple juice
used
•Dependent- amount of vitamin C
•Controlled- concentration of Iodine solution
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Procedure
• First, Iodine and distilled water were mixed to create a 25% Iodine solution.
• A starch indicator solution was made by adding .125 g of starch to 25 mL of distilled water.
• A vitamin C standard solution was made by mixing 125 mg of vitamin C with 50 mL of distilled water.
• The standard vitamin C solution was titrated by adding 3 drops of the starch indicator and measuring the amount of Iodine solution needed to turn the vitamin C solution black.
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Procedure• Then 20 mL of apple juice was titrated.
• After that, 40 mL of apple juice from concentrate was mixed with 40 mL of distilled water.
• 20 mL was titrated.
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Data
Vit. C Solution 0.06 M
Apple Juice 0.3 M
Concentrate 0.1 M
Amt. of Vit. C
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Conclusion• If two different types of apple juice differ in ingredients and/or type, then
they will have different amounts of Vitamin C.
• The hypothesis was supported: the 2 different types of apple juice contained different amounts of vitamin C.
• The apple juice (not from concentrate) contained the most vitamin C. The vitamin C solution contained the least vitamin C.
• Apple juice not from concentrate does not have any water added.
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Further Experimentation
•Experiment can be carried further by retesting and measuring the vitamin C in other fruit juices.
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Thanks for listening!
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