Is it an acid, base, or neutral? Make your own acid-base indicator from red cabbage, then test various household substances. Acids and bases are classes of materials that have different properties.

Space to play or pause, M to mute, left and right arrows to seek, up and down arrows for volume. Take a chunk of red cabbage and whizz it up in a blender with some warm tap water. Pour through a sieve ...

An acid-base indicator is a substance that changes color as the pH of the solution changes. Indicators work because they are weak acids which when in solution, exist in equilibrium with their ...