In the preparation of a soap, the fatty acid containing less than eight carbon atoms is not used, because the soap obtained:
Correct answer: C. Does not form an emulsion with the grease
- A. Forms a colloidal solution with water
- B. Is insoluble in water
- C. Does not form an emulsion with the grease
- D. Forms an emulsion with the grease
Explanation
A soap molecule requires a long, non-polar hydrocarbon tail to effectively dissolve in and emulsify grease particles. If the carbon chain is too short (less than eight carbons), the tail is not sufficiently hydrophobic to form stable micelles around grease.
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Industrial chemistry applies chemical reactions and material properties to the manufacture of adhesives, dyes and polymers. Coverage includes addition and condensation polymerisation, thermoplastics and thermosetting polymers, the structural basis of colour in dyes, and how adhesive composition enables bonding between surfaces.
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