write preparetion of soap.in science 1
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Take 20 ml of castor oil (triglyceride) in a beaker (250 ml). Prepare 20% NaOH solution (by adding 10 g of NaOH in 50 ml of water) in another clean beaker and add 30 ml of this solution in 20 ml castor oil. Stir it well with a clean glass rod so that a thick paste is formed
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Soap can be made from the base hydrolysis of a fat or an oil. This hydrolysis is called saponification, and the reaction has been known for centuries. Traditionally, soaps were made from animal fat and lye (NaOH). (Lye was traditionally made by pouring water through wood ashes.)
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