"Laboratory Production Method of Carbon Dioxide" The World of Carbon PPT Courseware 2

"Laboratory Production Method of Carbon Dioxide" The World of Carbon PPT Courseware 2

Teaching program

Problem raising - analysis, comparison - hypothesis, experiment - re-analysis, comparison - drawing conclusions to problem solving

Question 1: What aspects should be considered when preparing a gas in the laboratory?

Question 2: What factors determine the preparation device and collection method when preparing O2 and H2 in the laboratory?

Laboratory preparation of carbon dioxide

(1) Design ideas for laboratory gas preparation methods:

1. Determine the device according to the reaction conditions in the state of the reactants;

2. Determine the collection method based on the density of the produced gas compared with air and the solubility in water.

(2) Laboratory preparation method of carbon dioxide:

Raw materials: limestone (or marble) and dilute HCl

Reaction principle:

Device: (See Figure 5-17 on P93 of the textbook)

Collection method: upward exhaust air method

Inspection methods: 1. Clarified lime water 2. Burning wood sticks

Consolidation exercises:

1. It is best to use limestone and dilute hydrochloric acid to produce CO2 gas in the laboratory. The chemical equation of this reaction is CaCO3+2HCl==CaCl2+H2O+CO2.

2. The correct way to collect CO2 gas in the laboratory is to exhaust the air upward.

3. The way to check whether the CO2 gas is fully collected in the gas collecting bottle is to place a burning wooden stick flatly on the mouth of the gas collecting bottle. If the wooden stick goes out, it means that the gas has been fully collected, otherwise it has not been fully collected.

4. It is known that filter gas can be dissolved in water and is heavier than air. If the laboratory wants to collect Cl2, what method should be used?

Questions to think about: 1. The laboratory usually uses the following reactions to prepare hydrogen sulfide gas:

It is known that the reactant ferrous hydrogen sulfide is a massive solid, and the generated hydrogen sulfide gas is a gas that is soluble in water and heavier than air. Please design a generating device and a collection device for this gas. and explain the reasons.

2. Can other instruments be used for the Erlenmeyer flask in the generating device for preparing CO2, H2 or H2S gas?

Consolidation exercises:

1. There are existing large test tubes with broken bottoms, Erlenmeyer flasks, test tube plugs with conduits and other materials. Please use what you have learned to design a device for preparing CO2 gas that is more convenient to use, and explain its various principles.

2. In the textbook P68 Ex, the word "hydrogen" is changed to "carbon dioxide" gas.

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"Laboratory Production Method of Carbon Dioxide" The World of Carbon PPT courseware:

"Laboratory Method for Preparing Carbon Dioxide" The World of Carbon PPT courseware 1. Independent learning requirements: For problems that the teachers in this group cannot solve, the master will ask other teachers for advice. Session 1: Knowledge exchange. The teachers and friends will first check each other's review content and then follow the preview outline. Communicate with each other...