Today we reminded ourselves of the pH scale, indicators and reactions with acids (including neutralisation). Have a look at this animation on the pH scale.

A slideshow can be viewed at http://www.slideshare.net/griggans/acids-and-alkalis/1

Know your stuff? do the quiz

Sats questions on acids and alkalis

From Starch test

We tested our leaves for starch that we set up on monday. The parts of the leaves in the dark did not make any starch as you can see. The parts of the leaves in the light did make starch and went black. The plant we put in a bag with sodium hydroxide to remove carbon dioxide also did not go black. Can you explain these results?