Copper(II) hydroxide

Formula for Copper 1 oxide

1. The animation below shows the arrangement and the results of the experiment.
2. A piece of asbestos paper is placed in a combustion tube. Weigh with a chemical balance.
3. A spatula of dry copper(II) oxide powder in placed on the asbestos paper and the combustion tube and is weighed again.
4. Thistle funnel dropper is opened to allow the acid to flow into the conical flask.
5. Dry hydrogen gas is flowed through the combustion tube for several minutes. Collect some gas from the exit of combustion tube with test tube. Test the gas with a burning splint. If there is no 'pop' sound, then all hydrogen has been removed.
Precautionary steps : Hydrogen gas must be allowed to pass through the combustion tube for several minutes before the copper oxide is heated. This action is to remove all the air in the combustion tube. A mixture of hydrogen and air can cause an explosion when lighted.
6. The copper(II) oxide in heated and the excess hydrogen which exits at the end of the tube is lit.
7. Copper(II) oxide will glow red-hot and react with hydrogen.
8. The heating is stopped when there are no more red-hot glow of copper(II) oxide seen.
The flow of hydrogen gas must be continued throughout the heating. This is to ensure that air does not enter the combustion tube. Thus, the hydrogen gas must be seen to be burning continuously at the end of the combustion tube
9. The tube is cooled down. The product is weighed once again.
The hot copper metal is allowed to be cooled in a stream of hydrogen gas. This is to ensure the oxygen from the air does not oxidise the hot copper to copper oxide again.
10.
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