When learned the properties of alkaline oxide and acidic oxides in the junior middle school chemistry, we all wanted to see the phenomenon of the interaction between them. But because of the experiment is too difficult, we were often told not to do it in teaching. Both the teachers and students feel very sorry for that.
After repeated experiments, I have solved this problem; the operating processes of the experiment are as follows.
1. Experiment supplies
Two Penicillin bottles with plug, one medical large needle, a small balloon bag, 2 rubber droppers, a little fresh calcium oxide (CAS NO: 1305-78-8), and a little amount of dilute hydrochloric acid, clarification of calcium oxide water.
2. The experimental process
(1) Crushing the fresh calcium oxide into powdered form, and then packing 1 gram calcium oxide powder into the penicillin bottle, and filled with carbon dioxide gas, quickly with rubber plug sealing.
(2) Full fill the balloon bag with carbon dioxide gas, binding the large needle in the mouth of balloon bag, inserted it to the penicillin bottle quickly, and shake the penicillin bottle gently, so that the carbon dioxide and calcium oxide can full contact, and then placed it on the desktop.
3. Analyzing the experimental phenomena
(1) The balloon bag filled with carbon dioxide was gradually fade in the experiment, it means that the internal pressure of penicillin bottle decrease, it proves that chemical reactions occurred in the bottle, to reduce the carbon dioxide gas in the bottle.
(2) Adding dilute hydrochloric acid to the reaction of penicillin bottle of A and another containing penicillin bottle of B calcium oxide, respectively, and map 1b device quickly plug sealing filled with rubber dropper clear calcium oxide water, and oscillation of penicillin bottle, and gently squeeze the rubber head tube of calcium oxide water, control of calcium oxide water droplets do not fall in the penicillin bottle, and moved up and down in the burette, the calcium oxide water dropper bottle without changes in B, indicating no carbon dioxide gas produced. The bottle A dropper in calcium oxide water are slightly cloudy phenomenon, it proved that the calcium carbonate A bottle, which is composed of calcium oxide and carbon dioxide reaction to come, it produces and dilute hydrochloric acid reaction of carbon dioxide gas, so that the dropper of calcium oxide water turbid.
The experiment has the advantages of simple operation, obvious phenomenon, it is suitable for teacher’s demonstration experiment in the class, but also adapt to the student experiment.
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