Attached is a full lesson 5 page worksheet containing a detailed step-by-step method (including how to use the UV-vis), introduction including theory on Beer’s Law, space for students to tabulate and record their results, questions around the topic, answers and sample results. There are a couple of photographs (taken by me when I was trialling this) to help students visualise how things should look when they are carrying out the method.
This can take around 1 hour - 2.5 hour lesson depending on equipment availability and how you wish to deliver it. :-)
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