acid - A substance which turns blue litmus red and has a pH less than 7. It has a sour taste and a sharp feel., base - A substance that neutralises an acid to form a salt and water. It turns red litmus blue., alkali - A substance which reacts with an acid to form a salt and water. They are bases that dissolve in water., litmus paper - A paper that has been treated with different dyes that changes colour to indicate whether a substance is an acid or a base., universal indicator - A mixture of dyes that change to different colours according to how strong the acid or base is, pH scale - A scale, which runs from 0 to 14, which indicates the level of acidity or basicity of a solution, titration - A process used to determine the quantity of an acid that is required to exactly neutralise a fixed quantity of base, neutralisation - When an acid and a base react together and cancel each other out, producing a salt and water, lemon - A citrus fruit that turns universal indicator orange., toothpaste - A personal care product used every night and every morning that is mildly alkaline.,

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