7A test pH

During the last couple of lessons 7A have used litmus and universal indicator papers to assess the acidity or alkalinity of various substances.

The litmus paper comes in two colours blue and red.

One drip of solution is all it needs.

Compare the colour and write down the result

Lots of substances to test

Then clean out the petri dish

And start the next substance

Recording all results

And comparing colours

All very busy