Test of detecting iodine in salt- Home method

If it is important to you whether there is iodine in the salt you consume daily, you can very easily test it at home using this method that I gonna explain to you.

First of all, pour some water into a clean glass. Then add a little starch. Because if there is iodine in the salt, it combines with starch and shows us a blue-purple color. We also add some lemon juice that helps this reaction due to its acidic properties.

Here, we have previously prepared three different brands of salt that had "iodized salt" marked on their packaging. We also prepared some sea salt and rock salt in powder form and wanna kick off the experiment.

From the prepared solution, we take a teaspoon and pour it on the first salt so that it turns into a cone-like shape. We wait for a little; as you can see, it changed color, which means this salt contains iodine. Now we do the same for the second salt. This salt had a slight change of color, showing the presence of iodine in it, although very little. We then test the third salt. No color change can be observed, so this salt does not contain iodine! Finally we repeat the experiment on the sea salt and rock salt. Again no color change is seen in them, which means the absence of iodine in them.

As you can see, with a test at home, you can easily determine if there is iodine in the salt you use. Even based on the color change intensity, you can define if the iodine content of the salt is high or low.

The important points you need to note to carry out this test is that:

 1- The amount of lemon juice added to the solution should be almost twice the amount of water.

 2- It is better to use industrial lemon juice for the test. But if you intend to use natural lemon juice, pour more lemon juice into the solution and use a larger volume of it for testing. Because the acid level of natural lemon juice is lower than the industrial lemon juice!