base - a proton (H+ ion) acceptor, litmus - this indicator does not change colour in neutral solutions, exactly 7 - neutral pH, 0-14 - the range of the pH scale , alkali - a base that releases OH- ions in water, universal indicator - indicator showing the colours of the rainbow, acid - a proton (H+ ion) donor, corrosive - a substance that burns the skin is , bleach - an alkaline solution found at home , vinegar - an acid that you put on your chips, dilute - a way to make acids or alkalis less concentrated, Methyl orange - this indicator is yellow above pH4.4, Phenolphthalein - this indicator is colourless below pH 8.2, salt - formed when the hydrogen in an acid is replaced by a metal ion,

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