Read and download free pdf of CBSE Class 10 Science Chemistry Saponification Preparation of Soap Assignment. Get printable school Assignments for Class 10 Chemistry. Class 10 students should practise questions and answers given here for Practical Worksheets Chemistry in Class 10 which will help them to strengthen their understanding of all important topics. Students should also download free pdf of Printable Worksheets for Class 10 Chemistry prepared as per the latest books and syllabus issued by NCERT, CBSE, KVS and do problems daily to score better marks in tests and examinations
Assignment for Class 10 Chemistry Practical Worksheets
Class 10 Chemistry students should refer to the following printable assignment in Pdf for Practical Worksheets in Class 10. This test paper with questions and answers for Class 10 Chemistry will be very useful for exams and help you to score good marks
Practical Worksheets Class 10 Chemistry Assignment
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 .
Precautions
• Do not touch solid NaOH
• Stir the soap soln care fully so that it does not spill out.
• The mixture of oil ðanol may splatter or catch fire ,have a watch glass nearby to smother any flames.
Questions
• What is the by product of saponification reaction?
• What is the chemical reaction involved in soap preparation?
• Give a method to separate glycerol from the reaction mixture?
Distillation under reduced pressure
• Why is it advised to add common salt while preparing soap?
It helps in complete precipitation of soap.
Multiple choice questions
1. When you a 20% soln of NaOH in a beaker containing water, you record certain observations. Select the correct observations from the following:
a) NaOH is in the form of pellets/flakes.
b) It dissolves in water completely.
c) The beaker appears cold when touched from outside immediately after adding NaOH to water.
d) When litmus paper is dipped into the soln. It turns blue.
2. While preparing soap we generally add small amount of common salt to the reaction mixture of oil and NaOH. The purpose of adding common salt is
a) Make the soap neutral .
b) Reduce the basic nature of the soap.
c) Enhance the cleansing power of the soap.
d) Favour the precipitation of the soap.
3. A student dipped a red litmus paper in the soap soln. She observed that
a) It changed to blue.
b) It remained red.
c) It changed to green.
d) It changed to orange
4. Soaps have different foaming capacities due to
a) Different alkyl groups.
b) Different cations present
c) Same alkyl groups.
d) Same cation present in soap
5. Part of soap which is hydrophobic
a) Hydrocarbon
b) COONa
c) Both
d) None of these
6. Which is the by-product of saponification reaction?
a) Glycol
b) Glycerol
c) Ethanol
d) Methanol
7. Which process describes saponification ?
a) Acid hydrolysis
b) Esterification
c) Alkaline hydrolysis of ester
d) Alkali formation
8. A student is provided with four types of acids for the preparation of soaps. Which among the following is the most suitable one:
a) Acetic acid
b) Propanoic acid
c) Citric acid
d) Palmitic acid
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CBSE Class 10 Chemistry Practical Worksheets Assignment
We hope you liked the above assignment for Practical Worksheets which has been designed as per the latest syllabus for Class 10 Chemistry released by CBSE. Students of Class 10 should download and practice the above Assignments for Class 10 Chemistry regularly. We have provided all types of questions like MCQs, short answer questions, objective questions and long answer questions in the Class 10 Chemistry practice sheet in Pdf. All questions have been designed for Chemistry by looking into the pattern of problems asked in previous year examinations. You can download all Revision notes for Class 10 Chemistry also absolutely free of cost. Lot of MCQ questions for Class 10 Chemistry have also been given in the worksheets and assignments for regular use. All study material for Class 10 Chemistry students have been given on studiestoday. We have also provided lot of Worksheets for Class 10 Chemistry which you can use to further make your self stronger in Chemistry.
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a. Score higher marks: Regular practice of Chemistry Class 10 Assignments for chapter Practical Worksheets will help to improve understanding and help in solving exam questions correctly.
b. As per CBSE pattern: All questions given above follow the latest Class 10 Chemistry Sample Papers so that students can prepare as per latest exam pattern.
c. Understand different question types: These assignments include MCQ Questions for Class 10 Chemistry with answers relating to Practical Worksheets, short answers, long answers, and also case studies.
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How to Solve CBSE Class 10 Chemistry Practical Worksheets Assignment effectively?
a. Start with Class 10 NCERT and syllabus topics: Always read the chapter carefully before attempting Assignment questions for Class 10 Chemistry Practical Worksheets.
b. Solve without checking answers: You should first attempt the assignment questions on Practical Worksheets yourself and then compare with provided solutions.
c. Use Class 10 worksheets and revision notes: Refer to NCERT Class 10 Chemistry worksheets, sample papers, and mock tests for extra practice.
d. Revise tricky topics: Focus on difficult concepts by solving Class 10 Chemistry MCQ Test.
e. Maintain notebook: Note down mistakes in Practical Worksheets assignment and read them in Revision notes for Class 10 Chemistry
How to practice CBSE Class 10 Chemistry Practical Worksheets Assignment for best results?
a. Solve assignments daily: Regular practice of Practical Worksheets questions will strengthen problem solving skills.
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You can download free Pdf assignments for CBSE Class 10 Chemistry Practical Worksheets from StudiesToday.com
All topics given in Practical Worksheets Chemistry Class 10 Book for the current academic year have been covered in the given assignment
No, all Printable Assignments for Practical Worksheets Class 10 Chemistry have been given for free and can be downloaded in Pdf format
Latest syllabus issued for current academic year by CBSE has been used to design assignments for Practical Worksheets Class 10
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