When performing a scientific investigation on an unknown substance, how can an indicator help you determine if the substance is a starch?

The indicator will change the taste of the substance.

The indicator will change the smell of the substance.

The indicator will change the state of the substance.

The indicator will change the color of the substance.

1 answer

When investigating an unknown substance to determine if it is starch, the most relevant option related to using an indicator is:

The indicator will change the color of the substance.

Specifically, iodine is a common indicator used to test for the presence of starch. When iodine solution is added to a sample containing starch, it will change color to a blue-black, indicating the presence of starch.