4. Write the difference between soaps and detergents.
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Answer:
• Soaps are potassium or sodium salts of a carboxylic acid having a long aliphatic chain attached to it.
• They are surfactants (compounds that reduce the surface tension between a liquid and another substance) and therefore help in the emulsification of oils in water.
• Soaps are generally prepared via the saponification of fats and oils.
• The carboxylate end of the soap molecule is hydrophilic whereas the hydrocarbon tail is hydrophobic.
• Detergents are the potassium or sodium salts of a long alkyl chain ending with a sulfonate group.
are the potassium or sodium salts of a long alkyl chain ending with a sulfonate group.They are soluble in hard water.
• This solubility is attributed to the fact that the sulfonate group does not attach itself to the ions present in hard water.
• Commonly, anionic detergents such as alkyl benzene sulfonates are used for domestic purposes.