What's the concept behind indicators demo?
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Chem_Mod
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What's the concept behind indicators demo?
Question: What is the concept behind the indicator demonstration work?
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Chem_Mod
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Re: What's the concept behind indicators demo?
Answer: Bromothymol blue was used to show the pH of water in the presence of carbon dioxide and calcium oxide. Since carbon dioxide forms carbonic acid which is a weak organic acid the solution turned yellow. Since calcium oxide gives rise to strongly basic solutions, here the solution turned blue.
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