How do you test for starch?

2 Answers
Feb 24, 2016

Answer:

The most used test for starch is iodine.

Explanation:

Iodine forms a dark-blue complex with starch, at normal temperatures. Usually the iodine is dissolved in a solution of potassium iodide (#K^+I^-#) to form the complex ion #I_3^-#, because iodine doesn't dissolve well in water.
Sometimes it's dissolved in alcohol.

Mar 31, 2018

Answer:

Use an iodine solution.

Explanation:

Iodine is an effective tool to test for starch. At normal conditions, it is usually brown, while in the presence of starch, it turns blue-black. See this picture of the test:

http://slideplayer.com/slide/3526940/