Chemistry Experiments High School

chemistry experiments high school
Question: What happens when Vitamin C is added to an iodine and starch solution?

It’s a grade 10 high school chemistry question :)

As you may already know, an iodine and starch solution is an aqueous solution with a dark violet/black color. But when you add vitamin C to the solution, what happens? Can you provide a lengthy explanation for me? Tomorrow, I’m doing an experiment which tests the levels of vitamin C in different substances, but all I need to know for now is what will happen.

Answer: Vitamin C. reacts with iodine:

C6H8O6 + I2 ==> C6H6O6 + 2H+ + 2 I-

So you can use titration with iodine to find out the concentration of vitamin C. Since the reaction ratio is 1:1, moles vitamin = moles I2 at the endpoint, so concentrations (M) x volumes are also equal. The reasoning is a bit like in acid-base titrations, which you might have met.

The suspended starch forms a dark blue loosely held complex (almost a solid state solution) with I2, so long as there is any, so it acts as an indicator.

Chemistry experiment with catalyst


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