Part 1: Synthesis of an Ester from Alcohol and Carboxylic Acid (For NCEA Level 3 Organic Chemistry) скачать в хорошем качестве

Part 1: Synthesis of an Ester from Alcohol and Carboxylic Acid (For NCEA Level 3 Organic Chemistry)

This is an annotated practical demonstration covering how an ester can be prepared from an alcohol and a carboxylic acid. As new videos are published, they will be added to sciencescribe.co.nz STUDENT NOTES You need to be able to: determine the alcohol and carboxylic acid necessary to produce a particular ester describe what 'reflux' is and explain how it works. describe advantages/disadvantages in this method compared to preparing an ester using an acid chloride instead of a carboxylic acid (this will be covered in a future video). TEACHER NOTES As of 2015, all Science Scribe videos are recorded and uploaded in Ultra High Definition 4K. Teachers can use this to their advantage in the classroom. NCEA is a qualifications framework built under the New Zealand Curriculum. I am posting this message here as a VERY significant proportion of viewers originate from outside of New Zealand. Videos tagged with "NCEA" are aimed towards New Zealand science teachers and students so use your professional judgement when choosing a particular tutorial. As reaction mechanisms for esterification do not come into play until tertiary study, the role and function of concentrated sulphuric acid is often lost on our students. The mechanism does indeed show the sulphuric acid acts as a catalyst but students tend to "fall back" and justify the presence of sulphuric acid as removing water by forming hydronium ions or driving the reaction in a particular direction but I will leave this conversation between you and your students. Sulfuric acid (concentrated) has the appearance of a thick, slightly yellow, liquid. The yellow appearance has been lost due to the exposure of the camera.