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Catalytic Decomposition of Hydrogen Peroxide H2O2 – Elephant’s Toothpaste Experiment

Catalytic Decomposition of H2O2 – Elephant’s Toothpaste Experiment

Catalytic Decomposition of H2O2 – Elephant’s Toothpaste Experiment
Elephant's toothpaste is a foamy substance formed as a result of rapid decomposition of hydrogen peroxide. Elephant’s toothpaste reaction experiment is generally used for classroom demonstrations as it requires fewer ingredients and makes a "volcano of foam".
Elephant toothpaste

Description:

H2O2 is decomposed by Iodide Ion. Iodide ion is used as a catalyst and these iodide ions come from KI (Potassium Iodide) or NaI (Sodium Iodide). This decomposition reaction liberates water, oxygen and heat.

Materials:

30% H2O2 (Hydrogen Peroxide)
1 Liter Graduated cylinder
KI (Potassium Iodide) or NaI (Sodium Iodide).
Food Color for fun
Liquid Dish Detergent

Procedure:

1.  Pour 50 mL of 30% H2O2 (Hydrogen Peroxide) in 1 L graduated cylinder.
2.  Then, add 3-4 drops of food color in 1 L graduated cylinder to make colored H2O2 solution.
3.  Then, start adding liquid dish detergent or soap from the side of 1 L graduated cylinder to make a small layer of liquid dish detergent or soap over colored H2O2 solution.
4.  With the help of small beaker add KI or NaI in the cylinder containing H2O2 solution. As a result of reaction, oxygen gas generated and this gas creates large amount of colored foam. This foam comes out of graduated cylinder.

Discussion:

Decomposition of H2O2 (Hydrogen Peroxide) yields O2 (oxygen) and H2O (water). Reaction is catalyzed by I- (Iodide Ion); These Iodide Ion comes from KI or NaI

Reaction-

H2O2 (Aq) + I-1 (Aq) ---> H2O (liquid) + IO- (Aq)
IO- (Aq) + H2O2 (Aq) ---> H2O (liquid) +O2 (g) + I- (Aq)

Overall Reaction-

2H2O2 (Aq) ---> 2H2O (liquid) +O2 (g)

Safety:

Wear proper protective equipment likes hand-gloves and safety goggles when preparing and demonstrating this experiment. Remember concentrated H2O2 (Hydrogen Peroxide) can cause burns.

Video of Catalytic Decomposition of H2O2 – Elephant’s Toothpaste Experiment:






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Aldol Reaction

Aldol Addition / Aldol Reaction

Aldol Addition Reaction
 The name ALDOL is taken from Aldehyde and Alcohol.
When the enolate of an aldehyde or a ketone reacts at the α-carbon with the carbonyl of another molecule under basic or acidic conditions to obtain β-hydroxy aldehyde or ketone, this reaction is called Aldol Reaction.

Mechanism of Aldol Reaction

organic chemistry notes - Aldol reaction Mechanism
Aldol Reaction Mechanism - Acid Catalyzed and Base Catalyzed
 If we control kinetic condition for aldol reactions then mixed aldol addition reactions may be used for the preparation of the adducts that can not be obtain selectively.
This method begins with irreversible production of  kinetic enolate, for example by employ the sterically or delayed lithium-amide-base like LDA known as lithiumdiisopropylamide and abbreviated as LDA.
named reaction notes


Baeyer Villiger Oxidation

Baeyer Villiger Oxidation Reaction

Baeyer Villiger Oxidation
Baeyer Villiger Oxidation

The Baeyer Villiger Oxidation is  a oxidation reaction in which oxidative cleavage of a C-C bond near to a carbonyl group happen, which leads to conversion of ketone to ester or cyclic ketone to lactone. Baeyer Villiger Oxidation may be carried out with peracids like MCBPA or with  a Lewis acid and Hydrogen Peroxide.

Mechanism of Baeyer Villiger Oxidation

Mechanism of Baeyer Villiger Oxidation
Mechanism of Baeyer Villiger Oxidation

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