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Question

Which of the following substances are needed for the preparation of soap? 
  1. Animal fat
  2. Carbon dioxide 
  3. Sulphur dioxide 
  4. Sodium hydroxide 


Solution

The correct options are
A Animal fat
D Sodium hydroxide 
Soap is a sodium or potassium salt of fatty acids.
The steps involved in the prepartaion of soap are:
1) Sodium hydroxide is dissolved in water.
2) Oil or animal fat is melted and added to it.
3) The above mixture is stirred and then allowed to heat.
4) Before the mixture solidifies, it is poured into a mould of desired shape and on cooling soap is formed.
 

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