Question

what colour do red cabbage extract turn when added to a base or alkali ?

Answer 1

Red cabbage contains a chemical called anthocyanin. This changes colour depending on the acidity of its environment. It turns a pink/red colour in the presence of an acid, is purple when neutral and when added to an alkaline substance turns blue or green.

Answer 2

Red cabbage contains a chemical called anthocyanin. This changes colour depending on the acidity of its environment. It turns a pink/red colour in the presence of an acid, is purplewhen neutral and when added to an alkaline substance turns blue or green