Ginger is on a backpacking trip and makes some instant mashed potatoes for dinne

Question

Ginger is on a backpacking trip and makes some instant mashed potatoes for dinner. She adds a few drops of iodine to the water in order to purify it. When she mixes the water with the potatoes, she observes that the potatoes turn blue. Which of the following is a hypothesis pertaining to her observation?

A. Potatoes turn blue when mixed with iodine.

B. Potatoes turn blue when mixed with iodine because the iodine reacts wit the carbohydrates in the potatoes.

C. If potatoes turn blue when mixed with iodine because the iodine reacts with the carbohydrates, then spaghetti will also turn blue when mixed with iodine.

D. Adding butter to the potatoes will cause the blue color to disappear.

E. Using fresh potatoes instead of instant potatoes will produce the same blue coloration.

Explanation / Answer

* Potatoes turn blue when mixed with iodine because the iodine reacts wit the carbohydrates in the potatoes.

Explanation:

Iodine solution test is a standanrd test used to determine the presence of starch/carbohydrates. Carbohydrates in potatoes react with iodine solution to form a blue/black color confirming the presence of starch/carbohydrates.

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