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Chlorine Gas - How to Prepare Chlorine Gas

Gas Preparation Instructions


Vial of chlorine gas.

Vial of chlorine gas.

Ben Mills

These are instructions for preparing chlorine gas (Cl2) from potassium permanganate and concentrated hydrochloric acid.


potassium permanganate
concentrated hydrochloric acid

Gas Preparation

Add concentrated hydrochloric acid dropwise onto a small quantity of potassium permanganate crystals (in a flask). Collect the chlorine gas by upward displacement of air in a hood. Use proper safety precautions. Concentrated hydrochloric acid is extremely caustic. Chlorine gas is toxic.


6HCl + 2KMnO4 + 2H+ --> 3Cl2 + 2MnO2 + 4H2O + 2K+

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