What will happen when potassium iodide react with hydrogen per oxide?

Answer 1

This reaction decomposes Hydrogen peroxide into Water and Oxygen: Here is the stepwise process:

1> Hydrogen peroxide oxidizes the Potassium iodide into another salt called Potassium Hypoiodite, and itself gets reduced to water.

H2O2 + KI----> KIO + H2O

2>This salt is quite unstable and rapidly reacts with Hydrogen peroxide. Here the Peroxide ions disproportionates into Oxide ions and Molecular Oxygen gas.

H2O2 + KIO ----> KI + H2O + O2

So the overall reaction an be written as:

H2O2 --KI--> H2O + O2

Answer 2

When potassium iodide reacts with hydrogen peroxide, the reaction produces oxygen gas, water, and potassium hydroxide. This reaction is often used to demonstrate the catalytic decomposition of hydrogen peroxide by iodide ions.