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Organic Compounds

Why is a solu...

Question

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

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Solution

Acidic carbon dioxide reacts with basic potassium hydroxide to form potassium carbonate and water.
$2 K O H + C O_{2} \to K_{2} C O_{3} + H_{2} O$
The increase in the mass of U tube corresponds to the mass of carbon dioxide produced from which, the percentage of carbon in the organic compound is estimated.

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

Q. Which of following is used to absorb carbon dioxide evolved during the estimation of carbon present in an organic compound?

Q. Assertion :A solution of potassium hydroxide used to absorb carbon dioxide evolved during the estimation of carbon present in an organic compound. Reason: Carbon dioxide (

C O_{2}

) is slightly acidic in nature. Hence KOH, which is a strong alkali, dissolves

C O_{2}

evolved from the compound containing carbon and reacts with it to form

K_{2} C O_{3}

. Increase in the weight of potash bulbs will give the weight of

C O_{2}

Q. In the experiment to show that carbon dioxide is given out during respiration in humans, the student uses :
(1) lime water
(2) alcohol
(3) potassium hydroxide solution
(4) iodine solution

Q. The chemical used to absorb carbon dioxide during a test to check for the significance of carbon dioxide in photosynthesis is

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Organic Compounds

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