neutralisations, displacement of metals. Chemistry AT 1, 3, 5 and 6. 4.7.3.4 Acids produce hydrogen ions Recall that acids form 1 Define the following terms: Measure the pH of a Video clips: (H+) in aqueous solutions. hydrogen ions when variety of the following acid they dissolve in water solutions: Aqueous solutions of alkalis base YouTube: and solutions of alkalis contain hydroxide ions alkali acidic contain hydroxide ions. neutral. alkaline (HT only) Use the neutral. The pH scale, from 0 to 14, is Recall the pH numbers for the formulae of common a measure of the acidity or following solutions: Practical: measure the ions to write balanced alkalinity of a solution and pH change when a acidic ionic equations. can be measured using strong acid neutralises a alkaline universal indicator or a pH Recall that relative strong alkali. neutral. probe. acidity and alkalinity This is best done using Write the symbol equation for are measured by pH. A solution with pH 7 is a data logger and pH the neutralisation of an acid neutral. Aqueous solutions of Recognise that probe or digital pH and an alkali. acids have pH values of less aqueous neutralisation meter. WS 2.3 than 7 and aqueous solutions reactions can be Apparatus and of alkalis have pH values generalised to Describe the use of universal techniques Investigation greater than 7. hydrogen ions reacting indicator or a wide range of pH changes during
neutralisations, displacement of metals. Chemistry AT 1, 3, 5 and 6. 4.7.3.4 Acids produce hydrogen ions (H+) in aqueous solutions. Aqueous solutions of alkalis contain hydroxide ions The pH scale, from 0 to 14, is a measure of the acidity or alkalinity of a solution and can be measured using universal indicator or a pH probe. A solution with pH 7 is neutral. Aqueous solutions of acids have pH values of less than 7 and aqueous solutions of alkalis have pH values greater than 7. Recall that acids form hydrogen ions when they dissolve in water and solutions of alkalis contain hydroxide ions. (HT only) Use the formulae of common ions to write balanced ionic equations. Recall that relative acidity and alkalinity are measured by pH. Recognise that aqueous neutralisation reactions can be generalised to hydrogen ions reacting 1 Define the following terms: acid base alkali neutral. Recall the pH numbers for the following solutions: acidic alkaline neutral. Write the symbol equation for the neutralisation of an acid and an alkali. WS 2.3 Describe the use of universal indicator or a wide range Measure the pH of a variety of the following solutions: acidic alkaline neutral. Practical: measure the pH change when a strong acid neutralises a strong alkali. This is best done using a data logger and pH probe or digital pH meter. Apparatus and techniques Investigation of pH changes during Video clips: YouTube: