Chemical Changes

• Acids


  pH 1-6, red to yellow, a substance that forms aqueous solutions , produces H+ ions
• Alkali


  a base that dissolves in water to form a solution with a pH greater than 7, form OH+ ions in water
• Base

  Substance with a pH greater than 7, an insoluble base
• Neutralisation

  Reaction between acid and base which produces a salt and water
• When an acid neutralises a base, the products are neutral