Principle Ammonium nitrate melts at 169.5°C and decomposes into nitrous oxide and water at 220°C NH4NO3==Heating==N2O↑+2H2O Supplies used Large test tubes, an iron stand, an alcohol lamp, a sink, a collecting cylinder, and dry ammonium nitrate powder Operation 1. In a drying device that can be properly heated, at a temperature of 80--100°C, allow the ammonium nitrate to fully dry. Then use a dry mortar and pestle grinding, and then dry at 80 - 100 ℃ temperature, quickly put into the bottle with a stopper to keep spare. 2. Take 2g of the above dry ammonium nitrate, add dry test tube, assembled according to the figure, heating (cut short the stamen of the alcohol lamp, so that the flame is not too large). Ammonium nitrate melted into a liquid and later bubbles tumbled like water boiling. Collect the nitrous oxide gas by exhausting the air upward. Remarks 1. The temperature of heating in this experiment should not be too high. If the temperature is too high, it may decompose to produce nitrogen, nitric oxide and nitrogen dioxide. Especially at high temperatures can easily cause an explosion. 2. The amount of ammonium nitrate is controlled at about 2g to avoid explosion. 3. The mouth of the test tube should be slightly below the level. This will avoid the reaction of water generated with the heating part of the contact, causing the test tube rupture. 4. 2g of ammonium nitrate at room temperature, atmospheric pressure can theoretically be collected to 610mL of nitrous oxide, but due to the part of the molten ammonium nitrate with the water generated by the water flow, can only be collected to 300mL of gas, with a 250mL cylinder can be In addition, anhydrous sodium nitrate can also be used to decompose anhydrous sodium nitrate and anhydrous sodium sulfate mixture heated to produce! Other methods: 1, 30HNO3 + 8Fe === 8Fe (NO3) 3 + 3N2O ↑ + 15H2O 2, 4Zn + 10HNO3 (dilute) === 4Zn (NO3) 2 + N2O ↑ + 5H2O