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Acids and Alkalis

Acids and Alkalis. W Richards The Weald School. Quiz on acids and alkalis. Acid, alkali or both???. This a pH of less than 7 This could kill cells This is often used in cleaners or soap This would turn Universal Indicator red Sodium hydroxide is a common ____________

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Acids and Alkalis

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  1. Acids and Alkalis W Richards The Weald School

  2. Quiz on acids and alkalis Acid, alkali or both??? • This a pH of less than 7 • This could kill cells • This is often used in cleaners or soap • This would turn Universal Indicator red • Sodium hydroxide is a common ____________ • This would feel soapy on your skin • This could be a corrosive • This will turn universal indicator purple • This would taste sour • Lemon juice and vinegar are examples of weak _____

  3. Hazard signs to learn… h i Acid Corrosive Harmful Irritant

  4. Universal Indicator and the pH scale 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Strong acid Strong alkali Neutral Universal Indicator is a mixture of liquids that will produce a range of colours to show how strong the acid or alkali is: Stomach acid Lemon juice Water Soap Baking powder Oven cleaner

  5. Neutralisation Acid + alkali Salt + water E.g. hydrochloric acid + sodium hydroxide sodium chloride + water An acid and alkali will neutralise each other (if the correct amounts are used:

  6. Useful acid-alkali reactions 1) Hydrochloric acid is used in the stomach to help _______. If we eat too many “rich” foods our stomachs create too much ____ – this is called ______. This acid needs to be neutralised by taking indigestion tablets. 2) Soil is naturally acidic, mainly due to acid ____. This can have bad effects on ____ and vegetable growth, so the excess acid may need to be neutralised with an _____ or suitable fertiliser. Words – plant, digestion, indigestion, alkali, rain, acid

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