Describe in your own words how this set-up helps to prove that carbon dioxide is formed on burning fuels?
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At room temperature and atmospheric pressure CO2 is a colourless and odourless gas and, because of this, people are unable to see it or smell it at elevated concentrations. CO2 is not flammable and will not support combustion.
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Carbon dioxide reacts with calcium hydroxide solution to produce a white precipitate of calcium carbonate. Limewater is a solution of calcium hydroxide. If carbon dioxide is bubbled through limewater, the limewater turns milky or cloudy white.
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