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Test how much Vitamin C is in fruit juice

Suitable For

Grade 7

Difficulty

2

Time Required

 <2 Days

Supervision

Required

What’s it about?

‘Vitamin C’, also known as ascorbic acid, is one of the essential vitamins for good health. The actual function of ‘Vitamin C’ is to maintain strong connective tissue. If a person has an inadequate amount over a long period of time, they will suffer the deficiency disease called ‘scurvy’. We all know how important it is to get enough ‘Vitamin C’ in one’s diet, but which fruit juices contains the most Vitamin C? Find out in the following science experiment:

Topics covered

Vitamin C, Indicator, Iodine, Chemical reaction, Scurvy

What will I need?

  • 4x FRUIT JUICES
  • MEDICINE DROPPER
  • TAP WATER
  • MIXING BOWL & SPOONS
  • CORNSTARCH
  • IODINE SOLUTION
  • 3x DRINKING GLASSES

Procedure (Method)

Unfortunately, this section is only available in the e-book version of the project.

How does it work?

Unfortunately, this section is only available in the e-book version of the project.

In this science experiment we use a ‘chemical reaction’ that changes the colour of an ‘indicator’ (iodine) when there is a certain concentration of ‘Vitamin C’ in a given volume of juice. When iodine is mixed with cornstarch and water, a deep purple-blue coloured substance is formed. When the juice drops are added and when enough Vitamin C is added to this ‘indicator’, the purple-blue colour disappears. The lower the amount of fruit juice required turning the purple-blue colour white, the more Vitamin C is contained in the given fruit juice! (Compare your results with the chart in the e-book)

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