Make about 50 ml mixture of sodium hydroxide by dissolving 15 grams of sodium hydroxide in 50 ml water.
Mix both of them and heat the mixture. On heating for some time, it forms a thick paste. Add a little soda and common salt. The salt helps to separate soap from the mixture.
Now filter the mixture by using a filter paper. The residue left on the filter paper is the soap. Now pour the soap into a vessel of the desired shape.
Keep the soap untouched for a day and we get a soap of the desired shape. The remaining solution, or the filtrate, contains glycerin.
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