AP BIOLOGY

Detailed explanation-1: -Starch Test: Add Iodine-KI reagent to a solution or directly on a potato or other materials such as bread, crackers, or flour. A blue-black color results if starch is present. If starch amylose is not present, then the color will stay orange or yellow.

Detailed explanation-2: -Using an iodine solution, you can test for the presence of starch. When starch is present, the iodine changes from brown to blue-black or purple.

Detailed explanation-3: -Iodine is a common indicator to test for the presence of starch. The light orange-brown colour Iodine solution turns blue-black in colour when it reacts with starch.

Detailed explanation-4: -Dilute iodine solution is used to test the presence of starch in solutions. 2-3 drops of iodine solution are added to the solution to be tested. A blue-black colour appears if starch is present.

Detailed explanation-5: -Iodine-KI Reagent: Iodine does not completely soluble in liquids, so the iodine reagent is formulated in the presence of potassium iodide by breaking down iodine in liquids. This creates the complex of a linear triiodide ion soluble, which slides into the starch coil, creating a vivid blue-black appearance.