Acidic - A property that means a substance will have a pH less than 7, Alkaline - A property that means a substance will have a pH greater than 7, Concentration - A measure of the number of particles in a given volume, Corrosive - A hazard associated with concentrated, strong acids, Indicator - A substance used to identify whether solutions are acidic or alkaline, Irritant - A hazard associated with dilute acids, Neutral - A substance with a pH of 7, Neutralisation - The reaction between an acid and an alkali that forms a salt and water, Strong acid - An acid with a very low pH value for example: hydrochloric acid, sulphuric acid, nitric acid, Weak acid  - Acids that react less vigorously for example: ethanoic acid, citric acid,

Acids and Alkalis

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