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Class 11
Chemistry
Organic Chemistry Some Basic Principles and Techniques
why is a solution of potassium hydroxide used to a...

Question:
Why is a solution of potassium hydroxide used to absorb carbon dioxide evolved during the estimation of carbon present in an organic compound?

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.

2KOH + CO₂ → K₂CO₃ + H₂O

Thus, the mass of the U-tube containing KOH increases. This increase gives the mass of CO2 produced. From its mass, the percentage of carbon in the organic compound can be estimated.

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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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Question:
Why is a solution of potassium hydroxide used to absorb carbon dioxide evolved during the estimation of carbon present in an organic compound?