Oxygen production II
To demonstrate the preparation of oxygen at room temperature by the decomposition of hydrogen peroxide solution using a catalyst.
Cosa imparano gli studenti
La scienza alla base di questo esperimento
This method of preparing oxygen in the laboratory uses a catalyst and takes place at room temperature. Potassium iodide acts as a catalyst on hydrogen peroxide decomposition, giving a more convenient production.
Attrezzatura utilizzata
- Iron stand — 5404.51
- Universal clamp — 5416.20
- Right angle clamp — 5401.16
- Conical flask 150 ml — 1322.10
- Rubber stopper, 2 holes — 5450.80
- Dropping funnel — 1359.00
- Right angle bent glass delivery tube — 1468.07
- Provette — 1473,60
- Spatola — 5460.34
- Parafilm — 1646.00
Sostanze chimiche e reagenti
- Hydrogen peroxide, 3% solution (10 volume) — R:34 S:3-28-36/39-45
- Potassium iodide — R:42/43-36/37/38 S:26-38
- Acqua distillata
Note sulla sicurezza
- This reaction is very rapid. Do not use hydrogen peroxide solutions of greater concentration than stated in the procedure.
Domande per gli studenti
- Record your observations and state what reaction has occurred.
- How can you prove that this gas is really oxygen?
Cosa aspettarsi
<p>As Hydrogen Peroxide comes in contact with potassium iodide bubbles of gas escape from the solution. The potassium iodide catalyzes the hydrogen peroxide decomposition which produces oxygen and water.</p><p>Any of the methods described in the Oxygen production and properties experiment can be used to test for oxygen.</p>
Smaltimento
Add plenty of water to the conical flask and dispose of the liquid into the liquid wastes container. Dispose of the potassium iodide residues in the solid wastes container.
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