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Carbon and its Compounds — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceCarbon and its Compounds3 Marks
Question
What is a soap? Name one soap.
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Answer

A soap is the sodium salt (or potassium salt) of a long chain carboxylic acid (fatty acid) which has cleansing properties in water.
Example: Sodium stearate, C17H35COO-NA+

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Identify the compounds ‘A’, ‘B’ and ‘C’ in the following reactions:

  1. $\text{C}_2\text{H}_5\text{OH}\ +\ \text{CH}_3\text{CH}_2\text{COOH}\xrightarrow{\ \ \text{conc.H}_2\text{SO}_4\ \ \ \ }{'\text{A}'}\ +\ \text{H}_2\text{O}$

  2. $\text{CH}_3\text{COOC}_2\text{H}_5\ +\ \text{NaOH}\xrightarrow{\ \ \ \ \ \ \ \ \ \ \ }{'\text{B}'}\ +\ \text{Na}_2\text{CO}_3$

  3. $\text{CH}_3\text{COONa}\ +\ \text{NaOH(CaO)}\xrightarrow{\ \text{heat}\ \ \ }{'\text{C}'}\ +\ \text{Na}_2\text{CO}_3$

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