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Safe concentration of HCl for Year 8 students to use?

Submitted by sat on 13 September 2017

Firstly, it is important to assess the risk of each activity conducted considering

We recommend that the 6M HCl be used by the teacher as a demonstration only and not by Year 8 students. Science ASSIST considers that up to 2M HCl is sufficient for most general chemistry activities and recommends using the lowest concentration that delivers the desired outcome.

An alternative activity to demonstrate a colour change could be to use another pH indicator, such as universal indicator, which would change from green to red. Alternatively, students could make a pH indicator (e.g. from red cabbage, red onion, blueberries, beetroot or red or blue flowers etc.) to investigate colour changes, see Acids and bases. Flinn Scientific have produced a nice video on this see https://www.youtube.com/watch?v=vFjK8Tt-z8g

References:

Flinn Scientific. 2012. ‘Natural Indicators’. https://www.youtube.com/watch?v=vFjK8Tt-z8g (Accessed September 2017)

‘Acids and bases’. Science ASSIST website. https://assist.asta.edu.au/resource/2373/acids-and-bases (Accessed September 2017)