WARNING! This experiment is dangerous! You should NOT perform this at home. ONLY carry out this experiment, if you are a trained chemist, and you understand local safety and legal requirements, which are required to perform such experiments
- You may use a concentrated ammonia solution or prepare ammonia gas by yourself. To prepare ammonia gas put sodium hydroxide and ammonia nitrate into a flask (in the ratio 1:1). Add a little water to the flask to initiate the reaction, and close it with a stopper with a gas-vent. Collect the produced ammonia into an inverted 1l flask (ammonia gas is lighter than air). After this close the flask filled with ammonia with a stopper. If you use ammonia solution, just pour about 100 ml of the solution into the flask and close it with a stopper.
- Make a crucible with a long metal handle (like a ladle). Put about 10 g of ammonium dichromate in a deflagrating spoon.
- Heat ammonium dichromate above a burner.
- When ammonium dichromate starts to decompose forming ammonium (III) oxide, lower the deflagrating spoon into to the flask with ammonium. Many sparks of fire occur in the flask after this. You also may heat purchasable chromium (III) oxide and spray it in the flask with ammonia.