alkali - a substance with a pH higher than 7, indicator - a substance that changes colour with pH, exactly 7 - neutral pH, 0-14 - the range of the pH scale , sour - taste associated with acids, universal indicator - name of one common indicator, acid - a substance with pH lower than 7, corrosive - a substance that burns the skin is , bleach - an alkaline solution found at home , vinegar - an acid that you put on your food sometimes, dilute - a way to make acids or alkalis less strong,

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