SELECT * FROM question_mgmt as q WHERE id=3112 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=2 AND subId=9 AND chapterId=53 and ex_no='1' AND status=1 ORDER BY CAST(question_no AS UNSIGNED)

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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