Question 12.30 Why is a solution of potassium hydroxide used to absorb carbon dioxide evolved during the estimation of carbon present in an organic compound?
Class XI Organic Chemistry : Some Basic Principles and Techniques Page 364
Class XI Organic Chemistry : Some Basic Principles and Techniques Page 364
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HiHere is your answer,
CO₂ is slightly acidic in nature, therefore, it reacts with the strong base KOH to form K₂CO₃ and from the weight of the CO₂ obtained, percentage of carbon in the organic compound is calculated
2KOH + CO₂ -----> K₂CO₃ + H₂O
The increase in the weight of U-tube containing KOH gives the weight CO₂ produced and from the weight of the CO₂ obtained, percentage
%C = 12/44 × weight of CO₂ formed/ weight of the substance taken ×100