initiate class Discuss the discussion of why differences between these acid solutions dilute and might have different concentrated and PH values and why strong and weak one might be more when talking about acidic than another. solutions. Equipment: TBC Digital TBC CC9c Bases and C3.9 Recall that a base is any 1) show what happens to Students prepare a sample of Discuss chemical salts substance that reacts with an the pH of an acid solution pure, dry, hydrated copper reactions, reactants and acid to form salt and water when a range of sulfate crystals. products. Show only common neutralisers are students how to write C3.11 Explain the general reactions added, eg. Toothpaste, word and symbol of aqueous solutions of acids indigestion tablets, lime, Equipment: TBC equations, revise with: etc. Students discuss formula a metals what happens in these b metal oxides reactions and revise the Digital TBC c metal hydroxides meaning of neutralisation d metal carbonates noting what must be to produce salts happening to the C3.13 Describe a neutralisation hydrogen ions in the acid reaction as a reaction between an acid and a base 2) Show class some C3.15 Explain why, if soluble salts common salt and are prepared from an acid dissolve it in water. Ask and an insoluble reactant: students how they know a excess of the reactant is the salt is still there? added Could it have just
initiate class discussion of why these acid solutions might have different PH values and why one might be more acidic than another. Discuss the differences between dilute and concentrated and strong and weak when talking about solutions. Equipment: TBC Digital TBC CC9c Bases and salts C3.9 C3.11 C3.13 C3.15 Recall that a base is any substance that reacts with an acid to form salt and water only Explain the general reactions of aqueous solutions of acids with: a metals b metal oxides c metal hydroxides d metal carbonates to produce salts Describe a neutralisation reaction as a reaction between an acid and a base Explain why, if soluble salts are prepared from an acid and an insoluble reactant: a excess of the reactant is added 1) show what happens to the pH of an acid solution when a range of common neutralisers are added, eg. Toothpaste, indigestion tablets, lime, etc. Students discuss what happens in these reactions and revise the meaning of neutralisation noting what must be happening to the hydrogen ions in the acid 2) Show class some common salt and dissolve it in water. Ask students how they know the salt is still there? Could it have just Students prepare a sample of pure, dry, hydrated copper sulfate crystals. Equipment: TBC Discuss chemical reactions, reactants and products. Show students how to write word and symbol equations, revise formula Digital TBC
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