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 ...

A pH or acid-base indicator is a compound that changes color depending on the pH of the substance that is added to it. Acids and bases make pH indicators turn different colors. Two substances that ...

The pH scale is used to measure acidity and alkalinity. When an acid is neutralised, it forms a salt. Making salts Acids react with metals, bases and carbonates to produce salts. Neutralisation is ...

The pH scale shows how acidic a substance is. Learn what pH means and how it is measured in this KS3 chemistry guide from BBC Bitesize. Neutralisation reactions Acids and alkalis react together in ...