PUC Karnataka Science Class 12Department of Pre-University Education, Karnataka
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Solution - Explain the Following Terms with Suitable Examples - Anionic Detergents - PUC Karnataka Science Class 12 - Chemistry

Questions

Explain the following terms with suitable examples - Anionic detergents

Define the following: Anionic detergents

Solution 1

Anionic detergents

Anionic detergents are of two types:

1.Sodium alkyl sulphates: These detergents are sodium salts of long chain alcohols. They are prepared by first treating these alcohols with concentrated sulphuric acid and then with sodium hydroxide. Examples of these detergents include sodium lauryl sulphate (C11H23CH2OSO3Na+) and sodium stearyl sulphate (C17H35CH2OSO3Na+).

2.Sodium alkylbenzenesulphonates: These detergents are sodium salts of long chain alkylbenzenesulphonic acids. They are prepared by Friedel-Crafts alkylation of benzene with long chain alkyl halides or alkenes. The obtained product is first treated with concentrated sulphuric acid and then with sodium hydroxide. Sodium 4-(1-dodecy) benzenesulphonate (SDS) is an example of anionic detergents.

Solution 2

Anionic detergents are called so because a large part of their molecules are anions. ‘These are of two types:

(a)Sodium alkyl sulphates: For example, sodium lauryl sulphate, C11H23CH2OSO3 Na+.

(b)Sodium alkylbenzenesulphonates.Vor example, sodium 4-(l-dodecyl) benzenesu Iphphonate (SDS).

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APPEARS IN

 NCERT Chemistry Textbook for Class 12 Part 2 (with solutions)
Chapter 16: Chemistry in Everyday Life
Q: 21.2 | Page no. 454

Reference Material

Solution for question: Explain the Following Terms with Suitable Examples - Anionic Detergents concept: null - Cleansing Agents - Synthetic Detergents. For the courses PUC Karnataka Science, CBSE (Science)
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