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We will now learn about the double displacement reaction which is the last of the chemical reactions.
To demonstrate chemical double decomposition, we need
At first, we will take a test tube and add potassium iodide with the help of a spatula.
Notice that potassium iodide is white in colour.
Add water to this substance to make potassium iodide solution.
We now have potassium iodide solution.
We now have to prepare mercuric chloride solution.
Take another spatula and scoop out mercuric chloride into the test tube.
Make sure you don't mix up the spatulas.
Now, we will make mercuric chloride solution too.
We now have mercuric chloride solution.
Let's see what happens when we had the previously prepared potassium iodide solution to mercuric chloride solution.
After sometime you notice that mercuric iodide is at the bottom and potassium chloride at the top of the test tube.
Now, let's see how to write this reaction in the form of an equation.