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Acidity - Antacid tablets contain magnesium hydroxide (Mg(OH)2).
Bee sting - Baking soda (NaHCO3) is used to neutralise the acid in bee sting.
Acidic soil - Quick lime (CaO) is added to neutralise the excess acid. (CaO + H2O → Ca(OH)2 will neutralise the acid).
Acid rain - CaO or CaCO3 is used.
Harmful carbon dioxide absorbed by astronauts and submariners: The carbon dioxide exhaled in the breath of astronauts is often removed from the spacecraft by reaction with lithium hydroxide (LiOH).

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