Scientists use a scale called the pH scale to measure how acidic or basic something is. The scale runs from 0 to 14. Where 0 is the most acidic and 14 is the most basic. Around the middle we have ...

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.

In a British back garden, a leftover red cabbage can rival pricey pH kits. This simple colour trick shows whether your soil ...