(C) In the estimation of $C$ and $H$,the organic compound is burnt in a stream of pure oxygen or air. Since the amount of $H_2O$ produced is determine

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To ensure that the moisture present in the air does not affect the weight of $H_2O$ produced.

(C) In the estimation of $C$ and $H$,the organic compound is burnt in a stream of pure oxygen or air. Since the amount of $H_2O$ produced is determined by weighing,it is essential that the air used for combustion is free from moisture. If the air is not dry,it will contain $H_2O$ vapor,which will be absorbed by the $CaCl_2$ tube,leading to an incorrect (higher) mass of $H_2O$ and thus an inaccurate estimation of hydrogen.

Class 11 Chemistry 8-3.Organic Chemistry : Purification and characterization Quantitative Analysis

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What is the reason for passing dry air through the combustion tube during the estimation of $C$ and $H$?

A
To provide oxygen for combustion.
B
To remove moisture from the sample.
C
To ensure that the moisture present in the air does not affect the weight of $H_2O$ produced.
D
To increase the rate of combustion.

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8-3.Organic Chemistry : Purification and characterization

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Quantitative Analysis

Explain Quantitative Analysis.

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$0.3 \ g$ of an organic compound gave $50 \ mL$ of nitrogen collected at $300 \ K$ and $715 \ mm$ pressure in Dumas method. Calculate the percentage of nitrogen in the compound (aqueous tension of water at $300 \ K$ is $15 \ mm$).

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In the sulphur estimation,$0.471 \, g$ of an organic compound gave $1.44 \, g$ of barium sulphate. The percentage of sulphur in the compound is $...... \%$. (Nearest integer)
(Atomic Mass of $Ba=137 \, u$)

MediumJEE MAIN 2021

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During the estimation of nitrogen present in an organic compound by the Kjeldahl method,the ammonia evolved from $0.5 \ g$ of the compound neutralized $10 \ mL$ of $1 \ M$ $H_{2}SO_{4}$. Find the percentage of nitrogen in the compound. (in $\%$)

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What is the reason for passing dry air through the combustion tube during the estimation of $C$ and $H$?

Similar Questions

Explain Quantitative Analysis.

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

$0.3 \ g$ of an organic compound gave $50 \ mL$ of nitrogen collected at $300 \ K$ and $715 \ mm$ pressure in Dumas method. Calculate the percentage of nitrogen in the compound (aqueous tension of water at $300 \ K$ is $15 \ mm$).

In the sulphur estimation,$0.471 \, g$ of an organic compound gave $1.44 \, g$ of barium sulphate. The percentage of sulphur in the compound is $...... \%$. (Nearest integer)(Atomic Mass of $Ba=137 \, u$)

During the estimation of nitrogen present in an organic compound by the Kjeldahl method,the ammonia evolved from $0.5 \ g$ of the compound neutralized $10 \ mL$ of $1 \ M$ $H_{2}SO_{4}$. Find the percentage of nitrogen in the compound. (in $\%$)

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In the sulphur estimation,$0.471 \, g$ of an organic compound gave $1.44 \, g$ of barium sulphate. The percentage of sulphur in the compound is $...... \%$. (Nearest integer)
(Atomic Mass of $Ba=137 \, u$)