2. Unit 22 Chemical Laboratory Techniques Assignment 1 due – Friday 23 rd October Week 1 – Sodium Chloride Week 2 – Aspirin Week 3 – Ethyl Ethanoate Week 4 – Paracetamol Week 5 – Plant Extract Week 6 – Hand in

3. Unit 22 Chemical Laboratory Techniques Week 3 Lesson 1 – Preparing Ethyl Ethanoate Lesson 2 – Discussion of Techniques Used Lesson 3 – Preparing Ethyl Ethanoate and Purity of Ethyl Ethanoate

4. Unit 22 Chemical Laboratory Techniques Week 3 Lesson 1 – Preparing Ethyl Ethanoate Work in PAIRS Conc. Sulphuric acid and Glacial Ethanoic, Ethanol. Goggles Gloves Lab Coats Hair Ties Back Until instructed by your tutor

5. Preparing Ethyl Ethanoate and Assessing its Purity Ethyl Ethanoate can be synthesized by reacting glacial ethanoic acid with ethanol in the presence of concentrated sulphuric acid. The product is an ester This is an industrially important reaction as esters are used in many products This reaction is an esterification reaction. It is also a condensation reaction as water is released as a product during the reaction.

6. Preparing Ethyl Ethanoate and Assessing its Purity Key techniques - Distillation - Purifying an Organic Liquid

7. Preparing Ethyl Ethanoate and Assessing its Purity Issues Raised Problems when preparing Ethyl Ethanoate and how the method overcomes these? Uneven, vigorous boiling during distillation Unreacted ethanol Collecting desired product

8. Preparing Ethyl Ethanoate and Assessing its Purity Issues Raised Changes to the method to overcome additional problems identified? Were there any changes you would make next time to improve the method further. 1 or 2 of these suggestions finish the section off nicely