This experiment is from the official website of Tianjin Agricultural College

Operation method

Experiments on the preparation of methane and the properties of alkanes

Materials and Instruments

Anhydrous NaAc Soda lime NaOH (s Br2∕CCl4 KMnO4 aq H2SO4 n-heptane
Rigid large test tubes Glass catheters Test tubes Glass sinks Large draw tubes Dropping funnels 9. tinfoil Glass rods Gas plugs Infrared lamps

Move

1. Preparation: 5 g NaAc (anhydrous), 3 g soda lime, 2 g NaOH (s), placed in a mortar and pestle in a rapid study of fine mixed with tinfoil wrapped into a cylinder, placed in a large rigid test tube, check the device is not leaking, with a small flame of the gas lamp Xu Xu uniformly heated the whole test tube, and then a larger flame strong heat near the mouth of the test tube of the reactant, so that the reactant reaction, and then gradually move the flame towards the bottom of the test tube. Gradually move the flame to the bottom of the test tube. After the air is estimated to be exhausted, collect methane by the drainage method and do the following experiments on its properties.

2. properties:

Substitution reaction

Flammability

Caveat

1. Drugs should be dry and waterless, operated quickly, prevented from absorbing moisture, and the device should be tightly closed.

2. Use concentrated sulfuric acid to pay attention to safety, to prevent burns, spilled on the counter and the ground.

3. The purpose of wrapping the drug with tinfoil: to prevent corrosion of the test tube, good heating effect4. Heating should be moved, from front to back, to prevent centralized heating and burning of the test tube.

5. After collecting the gas, disconnect the conduit between the sulfuric acid and the large test tube to prevent backsiphoning, and then extinguish the flame.

6. When the experiment is finished, pour the concentrated sulfuric acid into the waste bucket carefully.

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