Acidity of everyday substances

20140515-072513.jpgAs part of our acids and bases module, one activity that the students need to do is to use a range of indicators to qualitatively compare the acidity of different household substances. My Year 12s looked at the following:
Baking soda
Cream of tartar
Shampoo
Hand soap
Vinegar
V energy drink
Bleach
Kitchen spray cleaner
Alka-seltzer
Salt

They used phenolphthalein, methyl orange and bromothymol blue. Here’s their results:

20140515-072550.jpg

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