Acid - pH below 7, Alkali - pH above 7, Lemon - A strong acid, can be eaten, Bleach - An alkali, used in the bathroom, Neutralisation - An acid and alkali react to make pH7, Neutral - pH7, Indicator - Used to identify the pH of a substance, Purple - The colour universal indicator turns in a strong alkali, Red cabbage - Vegetable that can be used to make pH indicator, Baking powder - Can be used to treat an acidic bee sting,

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