Assignment for Class 10 Chemistry Practical Worksheets
Class 10 Chemistry students should refer to the following printable assignment in Pdf for Practical Worksheets in standard 10. This test paper with questions and answers for Grade 10 Chemistry will be very useful for exams and help you to score good marks
Practical Worksheets Class 10 Chemistry Assignment
CBSE Class 10 Science Chemistry Saponification Preparation of Soap Assignment. Students are advised to refer to the attached assignments and practice them regularly. This will help them to identify their weak areas and will help them to score better in examination. Parents should download and give the assignments to their children for practice.
Objective: To study Saponification reaction for the preparation of Soap.
Requirements: Sodium hydroxide, vegetable oil, ethanol, common salt, distilled water, beakers, measuring cylinder etc.
Theory :
Soaps are sodium or potassium salts of carboxylic acids with long hydrocarbon chains. Soap can be made from the base hydrolysis of fat or oil. The process in which oil or fat reacts with NaOH to form soap(sodium salt of fatty acid) and glycerol is called saponification reaction
Procedure :
• Take about 20 ml of vegetable oil in a beaker.
• Add 15 ml of ethanol &25 ml of 20 %NaOH to vegetable oil with stirring.
• Heat the mixture for 20 minutes until the solution no longer has 2 separate layers.(do not over heat the mixture to dryness).
• Remove the beaker from the burner,& add 20 ml of saturated NaCl solution.This process is called ‘salting out’ .
• Cool the mixture till it becomes solid
• Remove &cut it into desired shape &size.
Result
Soap solution is basic in nature .
Please click the link below to download CBSE Class 10 Science Chemistry Saponification Preparation of Soap Assignment
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