1.

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

Answer»

CO2 is acidic in nature, therefore, it reacts with the strong base KOH to form K2CO3.

2KOH + CO2                  K2CO3 + H2O

The increase in the mass of U-tube containing KOH then gives the mass of CO2 produced and from its mass, the percentage of carbon in the organic compound and can be estimated by using the equation:

% of Carbon = 12/44* Mass of CO2 formed/ Mass of substance formed*100



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