PRACTICAL WORK

PRACTICAL WORK

TEST FOR STARCH

AIM

To detect the presence of starch in the given sample solution.

MATERIAL REQUIRED

Sample starch solution (prepared by dissolving a pinch of starch powder in the boiling water or rice water can be used), iodine solution, test tube, test tube holder, spirit lamp etc.

Preparation of reagent

Lugol iodine solution

Potassium iodide -2g

Iodine crystal      -1g

Distilled water     -100ml

IODINE TEST

PROCEDURE

Take 1ml of the sample solution to be tested in a dry test tube. Add  a few drops of iodine solution to the sample solution and mix it well.

OBSERVATION

The solution will turn dark blue.

INFERENCE

The dark blue colour of the solution indicates the presence of starch as confirmed in the given solution starch react with iodine in presence of iodine to form an intensely blue coloured complex while is visible at very low cone of iodine.

Submitted By,

Divya.R.S.

Roll.No.:7

Natural Science