Question

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


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Answer 1

CO₂ is slightly acidic in nature Hence KOH, which is a strong alkali dissolves Co₂ evolved from the compound containing C and reacts with it to form $\sf K₂CO_3$

Increase in the wt. of potash bulb will give the wt. of CO₂ evolved:

$\bf 2KOH+CO_2 \longrightarrow K_2CO_3+H_2O$

Therefore, the weight of the U-tube containing KOH increases. This increment in the weight of the U-tube gives the mass of $\sf CO_2$ produced. From its weight, the ratio or percentage of carbon in the organic compound can be estimated.

Answer 2

Explanation:

 Carbon dioxide is acidic in nature and potassium hydroxide is a strong base. ... Thus, the mass of the U-tube containing KOH increases. This increase gives the mass of CO2 produced

Hope that the answer helps you.