- To study Saponification reaction
- Dil. Sodium hydroxide solution
- vegetable oil such as castor/ coconut oil (25 mL)
- common salt (about 10 g)
- beakers (50 mL)
- test tubes
- Take about 10 mL of coconut oil in a beaker
- Add 15 mL of sodium hydroxide in the beaker (It is exothermic reaction)
- Add 5 g of common salt to this mixture and using a glass rod to stir the mixture continuously till the soap begins to set.
- Leave it for a day till the mixture cools and becomes solid.
- Filter the mixture to separate out the soap
- Remove the soap cake and cut it into desired shapes and sizes
Observations and Findings:
- Does it smell like any soap that you have used?
- Wash your hands with your soap. Does it lather like regular soap?
- Does it clean your hands as well as regular soap? Explain.
- Heat is liberated during saponification
- Oil or fat when treated with sodium hydroxide solution, gets converted into sodium salt of fatty acid (soap) and glycerol. This reaction is known as saponification.