Alkali - A base that disolves in water, Base - A substance that gas a hydroxide ion, Acid - A substance that has a hydrogen ion, Dilute - A solution that has a small amount of solute dissolved in a large amount of solvent, Concentrated - A solution that has a large amount of solute in a small amount of solvent, Indicator - A substance that changes colour to identify if another substance in an acid or a base, pH scale - Compares the strength of different acids and bases, Neutralisation - The reaction of an acid and base to form a salt,

Acids and Bases match the definitions

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