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JAMB Chemistry 1985 Question 49

Question 49

Fats, Oils and Soaps

Which of the following roles does sodium chloride play in soap preparation? It

  1. A.reacts with glycerol
  2. B.purifies the soap
  3. C.accelerates the decomposition of the fat or oil
  4. D.separates the soap from the glycerol
  5. E.converts the fatty acid to its sodium salt.
Show the answer and explanation

Answer: D (separates the soap from the glycerol)

Explanation

Soap is less soluble in strong salt solution, so adding NaCl makes the soap come out of the mixture while the glycerol stays dissolved. This is called salting out.