Alkali - A substance with a pH between 8 - 14, Acid - A substance with a pH between 1 - 6, Litmus - Type of paper that can be used to determine whether a substance is an acid or an alkali, RedCabbage - A vegetable that can be turned into a natural indicator, Neutral - A substance with a pH of 7, Citric - Oranges contain this type of acid, Indicator - Something that can tell you if a substance is an acid or an alkali, Toothpaste - You use this alkali substance to brush your teeth, Water - This is an example of a neutral substance, Red - Universal indicator turns this colour in strong acids., Purple - Universal indicator turns this colour in strong alkalis.., Blue - Universal indicator turns this colour in weak alkalis..,

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