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When baking soda reacts with vinegar they produce carbon dioxide. How can you identify that gas?
Question Date: 2016-05-26
Answer 1:

Great question. Carbon dioxide gas is colorless, odorless, and doesn't react with any household chemicals, so how can we detect it?

A good way is using a spectrometer. You use this measuring instrument to shine a special light through a gas. The gas will absorb certain parts of that light in a way specific to what chemical it is: this is called its absorption spectrum. The rest of the light passes through the gas and into the spectrometer which tells you what's left.

To detect carbon dioxide, we usually use infrared light, so that kind of spectrometer is called an infrared spectrometer.

Answer 2:

Carbon dioxide dissolved in water is acid. You might try to bubble the gas through a column of water and watch the pH drop.

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