How do you test for the presence of iodine?

To test for the presence of iodine, you can perform several chemical tests. Here are two common methods:

1. Starch Test: This test is based on the observation that iodine reacts with starch to form a dark blue-black complex.

- Add a few drops of iodine solution to a test tube containing a starch solution.

- Observe the color change.

- If the solution turns a dark blue-black, it indicates the presence of iodine.

2. Silver Nitrate Test: This test is based on the observation that iodine reacts with silver nitrate to form silver iodide, a pale yellow precipitate.

- Add a few drops of iodine solution to a test tube containing silver nitrate solution.

- Observe the formation of a pale yellow precipitate.

- This indicates the presence of iodine.

Both these tests are widely used for quick and simple detection of iodine in various settings, such as in laboratories, water quality testing, or in certain industries. Remember to follow proper safety guidelines and wear appropriate protective equipment while handling chemicals.