Chemistry
Calcium hydroxide solution is used to detect the presence of carbon dioxide gas, while sodium hydroxide is NOT. Justify.
Analytical Chemistry
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Answer
Calcium hydroxide, when reacted with CO2 gives visible white precipitate of CaCO3. This verifies the test for CO2. However, sodium hydroxide does not give a visible change when reacted with CO2. This reaction forms sodium carbonate, which remains dissolved in solution. So, sodium hydroxide cannot be used to detect CO2 reliably.
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