Question

Is starch solution in water stable?

Answer 1

Starch comes in the form of semi-crystalline granules that are insoluble in cold water. Conventional ultrasonic treatment at room temperature will not help to dissolve the granules, but results in the formation of holes and pits in the granule surface. 

Answer 2

Starch solutions, prepared by either method, have a poor shelf life and will deteriorate quickly. Therefore, a fresh starch solutionshould be prepared on the day of the lab.Starch solutions are often used as indicators for detecting the presence of iodine.