Measuring the pH of a Variety of Household Substances
As part of our School Garden Project, Owls investigated the pH of a number of household substances as well as the soil in the school garden. This will help us decide what types of plants will grow best in our soil.
Owls researched a range of substances to determine their pH then predicted what the pH would be of the substances to be tested. In the experiment we used a Universal Indicator Solution made from chopped up red cabbage which, when soaked in warm water, releases pigment molecules called anthocyanins. These anthocyanins change colour depending on the pH of the environment they are in.
Acidic solutions turn them red and very alkaline solutions green/yellow. In neutral solutions the anthocyanin remains dark blue/purple.