Genie In A Bottle Experiment

Q: What'due south trapped in the bottle?

Only three things are needed for this demonstration: hydrogen peroxide, a catalyst, and flask with a narrow neck. (OK, perchance more three things. Those involved with running this kind of demo should actually wearable safety glasses and gloves.) First, about fifty milliliters of 30% hydrogen peroxide is added to a flask (such every bit an Erlenmeyer flask or rounded humid flask with a apartment lesser). And so, a catalyst is dropped in. Finally, a genie (or puff of h2o vapor) emerges from the canteen.

No magic is necessary- just a scrap of science.

The chemic chemical compound hydrogen peroxide (H₂O₂) is often used equally a bleaching amanuensis or disinfectant. Over time, hydrogen peroxide will intermission down or decompose into h2o and oxygen.

two H_twoO₂ (aq) ⟶ O₂ (one thousand) + ii H₂O (l)
(The abbreviation "aq" stands for "aqueous." This means that the substance has been dissolved in water. The other abbreviations used are for liquid (l) and gas (one thousand).)

Because hydrogen peroxide decomposes slowly on its own, the genie in a bottle sit-in requires a goad to speed the reaction up. A catalyst lowers the activation free energy, or the energy required to kickoff a reaction. The lower activation energy makes it "easier" to start the reaction, and the rate goes up.

In that location are a few catalysts that can exist used for hydrogen peroxide decomposition. Two of them are potassium iodide (KI) and sodium iodide (NaI). In both cases, the iodide ion is the part that acts as the goad by participating in the beneath pair of reaction steps.

H_iiO₂ (aq) + I^– (aq) ⟶ H_twoO (50) + IO^– (aq)
H_iiO_ii (aq) + IO^– (aq) ⟶ H₂O (50) + O₂ (1000) + I^– (aq)

Because the iodide is a goad, it isn't consumed or used upwardly in the reaction. Instead, the reaction starts with iodide and ends with iodide, and the iodide can exist used again.

Some other possible catalyst to employ for the reaction is manganese dioxide (MnO₂). The possible reaction mechanisms involving manganese dioxide and hydrogen peroxide can be found at this link.

And so if you add a catalyst to the hydrogen peroxide in the canteen, the reaction is accelerated, and oxygen and water are quickly created. The "genie" that shoots up from the bottle is the water vapor that is propelled out of the bottle with a petty help from the oxygen.

Does this demonstration sound familiar? It might be because information technology's pretty shut to the elephant toothpaste demonstration. It'due south the same decomposition reaction sped upwards with a catalyst, simply with some added soap to assistance brand the foam.

Like the elephant toothpaste demo, the genie in a bottle sit-in is exothermic, meaning information technology releases rut. If you were to bear upon the flask, you would feel but how warm it gets later the reaction has been completed.

There are a few little upgrades yous can practise to make the demonstration more "showy." For example, a prepare-up that I used before involved a flask covered in aluminum foil with fake gemstones glued on. I've too seen this demonstration where the catalyst was wrapped in a chip of tissue paper and tied to a string. The cord was then wedged with a cork and so that the packet hovered over the hydrogen peroxide until the cork was removed. The package of catalyst then dropped in to kick-start the reaction, releasing the genie.

Unfortunately, you won't get 3 wishes from this demonstration. Sorry.

genie mouth drop