4.1 (a) To conduct a qualitative test for starch

Before you start get or make a copy of this Table of results SampleInitial colourFinal colour A – Starch solution B – Water

Step 1 Label two boiling tubes A and B.

Step 2 Place 2 ml of starch solution into tube A.

Step 3 Place 2 ml water into tube B.

Step 4 Add 2-3 drops of iodine solution into each tube.

Step 5 Swirl both tubes. Observe colour change.

Expected Result Positive: blue / black Negative: colour of iodine

Step 6 Table of results: SampleInitial colourFinal colour A – Starch solution B – Water

END