Two experiments in order to detect carbon dioxide or CO2.
First one: with limewater (calcium hydroxide diluted in water). When CO2 is bubbled through the limewater, it reacts and produces calcium carbonate. Because calcium carbonate is not soluble in water, the water gets turbid.
Second one: prepare a low concentration solution of sodium hydroxide (NaOH) or caustic soda (lye). With some drops of phenolphthalein the presence of a basic or alkaline medium (NaOH) is detected by turning pink. When we add CO2 it combines with NaOH to form Na2CO3 (sodium carbonate) so the PH decreases to a point the the water turns colorless.
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6 окт 2024