Acid - Has a pH value of less than 7, Alkali - Has a pH value greater than 7, Base - A substance that will neutralise an acid., Corrosive - This may dissolve or burn, indicator - A substance that changes colour to show whether a solution is acidic or alkaline, neutral - A solution that has a pH value of 7, pH scale - used to show whether a solution is acidic or alkaline, Hazard Symbols - Symbols designed to warn of potential dangers,

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