Nigel Baldwin | Hydrogen peroxide and potassium iodide C0079 @nigelbaldwin3184 | Uploaded April 2020 | Updated October 2024, 7 hours ago.
High School Chemistry
Rates of reaction - Effect of a catalyst on the decomposition of hydrogen peroxide.
The solid being investigated as a catalyst in this video clip is potassium iodide.
Potassium iodide KI, 0.1g was mixed with hydrogen peroxide 10ml, 6% and the oxygen gas produced measured using a gas syringe.
This is a well known reaction used for a demonstration known as the elephant toothpaste reaction when detergent and food colour is added to the mixture.
More detail on the reactions involved can be found here
https://chem.rutgers.edu/cldf-demos/1019-cldf-demo-elephant-toothpaste
At GCSE level we define a catalyst as a substance that speeds up a chemical reaction but can be recovered in its original form at the end of the reaction.
The brown colour observed in the flask during the reaction is probably due to the presence of iodine, so there is scope for discussion as to whether one would get all the catalyst back as potassium iodide at the end of the reaction.
High School Chemistry
Rates of reaction - Effect of a catalyst on the decomposition of hydrogen peroxide.
The solid being investigated as a catalyst in this video clip is potassium iodide.
Potassium iodide KI, 0.1g was mixed with hydrogen peroxide 10ml, 6% and the oxygen gas produced measured using a gas syringe.
This is a well known reaction used for a demonstration known as the elephant toothpaste reaction when detergent and food colour is added to the mixture.
More detail on the reactions involved can be found here
https://chem.rutgers.edu/cldf-demos/1019-cldf-demo-elephant-toothpaste
At GCSE level we define a catalyst as a substance that speeds up a chemical reaction but can be recovered in its original form at the end of the reaction.
The brown colour observed in the flask during the reaction is probably due to the presence of iodine, so there is scope for discussion as to whether one would get all the catalyst back as potassium iodide at the end of the reaction.
