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Organic Chemistry: Some Basic Principles and Techniques — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistryOrganic Chemistry: Some Basic Principles and Techniques5 Marks
Question
Why is a solution of potassium hydroxide used to absorb carbon dioxide evolved during the estimation of carbon present in an organic compound?
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Answer

Carbon dioxide is acidic in nature and potassium hydroxide is a strong base. Hence, carbon dioxide reacts with potassium hydroxide to form potassium carbonate and water as
3KOH + CO2 → K2CO3 + H2O
Thus, the mass of the U-tube containing KOH increases. This increase in the mass of U-tube gives the mass of CO2 produced. From its mass, the percentage of carbon in the organic compound can be estimated.

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