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Orsat Apparatus

The Orsat apparatus is used to measure volumes of carbon dioxide, oxygen and carbon monoxide within a fixed volume of a sample gas (100cc). However it is not particularly accurate at detecting very low concentrations.

The Orsat apparatus works using a very simple method. To find the volume of a particular gas within the sample a fixed volume of the sampled gas is passed through a specific solution which absorbs only the required gas. The remaining volume of the gas can then be re- measured and compared with the original volume to find the proportion of a specific gas within the sample.

The sampled gas is passed through a sequence of solutions each removing one of the gases and the remaining volume calculated afterwards. A solution of caustic potash is used to absorb the carbon dioxide, a mixture of pyrogallic acid, caustic potash and water is used to absorb the oxygen, and to remove the carbon monoxide a solution of cuprous chloride is used.

BUT AS SUGGESTED USE ELECTRONIC TESTING, IT IS MORE ACCURATE.

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