Colorimetry is a simple technique based that can be used to teach basic measuring skills. When used in a context such as “the amount of copper in a copper ore” the back story adds to the learning experience and can be expanded to include things such as environmental issues. The colours and use of simple apparatus engages the school pupils and they really engage well with the activity.
This experiment is based on one found in the Royal Society of Chemistry book ‘Classic chemistry experiments’. We have modified it a little and often play a game at the end looking at the likely impact of a mine on an area and the considerations that need to be factored in when decisions like this are made.
In the basic experiment students measure the colour of the ‘ore’ sample solution by eye but in recent times we have started using smart phone apps to bring technology into the classroom.
Although there are safety issues with using the sulfuric acid, we have used this with year 5 and 6 pupils. However, these classes are part of our program and have had a few years of working with us and handling glassware and chemicals before we progress to this level of work.
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