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प्रश्न
Why is a solution of potassium hydroxide used to absorb carbon dioxide evolved during the estimation of carbon present in an organic compound?
उत्तर
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 as
\[\ce{2KOH + CO_2 -> K_2CO_3 + H_2O}\]
Thus, the mass of the U-tube containing KOH increases. This increase in the mass of U-tube gives the mass of CO2 produced. From its mass, the percentage of carbon in the organic compound can be estimated.
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संबंधित प्रश्न
Discuss the chemistry of Lassaigne’s test.
Which of the following compounds contain all the carbon atoms in the same hybridisation state?
(i) H – C ≡ C – C ≡ C – H
(ii) CH3 – C ≡ C – CH3
(iii) CH2 = C = CH2
(iv) CH2 = CH – CH = CH2
For testing halogens in an organic compound with AgNO3 solution, sodium extract (Lassaigne’s test) is acidified with dilute HNO3. What will happen if a student acidifies the extract with dilute H2SO4 in place of dilute HNO3?
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