Acids and Alkalis Examples: The ions present in: Acids are….. Alkalis are… Label the pH scale with: Numbers 1-14 Colour of each pH Whether each number is a strong acid, weak acid, neutral, weak alkali or strong alkali Neutralisation: (explain what neutralisation is. Include: an equation, what happens to the reactantss, what happens to pH) A substance with a pH of: Less than 7 is an… =7 is More than 7 is an… The rule for naming salts... Concentrated and dilute What is the difference between a concentrated and dilute acid? Acids and Alkalis Match each salt with the substances that react to form it Reactions of acids: Acid + Metal Oxide Acid + Alkali Making salts: hydrochloric acid + potassium   barium sulfate sulfuric acid + barium lithium chloride hydrochloric acid + lithium potassium chloride nitric acid + sodium sodium nitrate Acid Salt formed Hydrochloric acid Nitric acid Sulphuric acid

Data interpretation: Harry used a data probe to record the pH of some of his favourite drinks: Indicators Blue litmus paper Universal indicator pH probe and data logger What does it show you? Colour in acid Colour in alkali Colour in neutral Advantage of this method Disadvantage of this method Drink pH Orange juice 3.5-4.0 Coke 2.5-3.5 Milk 8.0-8.5 Soda water 5.5-6.0 Tap water 7.5-8.0 Which drink is the weakest acid? Which drink is the closest to neutral? A dentist suggests that you should try to drink only alkaline or neutral drinks. Which 2 drinks are the most suitable? What would Harry need to do to ensure he had conducted a fair test? Harry only tested the drinks once. How could he improve his method?