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# Solution for Why is a Solution of Potassium Hydroxide Used to Absorb Carbon Dioxide Evolved During the Estimation of Carbon Present in an Organic Compound? - CBSE (Science) Class 11 - Chemistry

ConceptQualitative Analysis of Organic Compounds - Detection of Carbon and Hydrogen

#### Question

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

#### Solution 1

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

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.

#### Solution 2

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

2KOH + CO2 ——–> K2CO3+ H2O.

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#### APPEARS IN

NCERT Solution for Chemistry Textbook for Class 11 (2016 to Current)
Chapter 12: Organic Chemistry - Some Basic Principles and Techniques
Q: 30 | Page no. 364
Solution Why is a Solution of Potassium Hydroxide Used to Absorb Carbon Dioxide Evolved During the Estimation of Carbon Present in an Organic Compound? Concept: Qualitative Analysis of Organic Compounds - Detection of Carbon and Hydrogen.
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