Describe the use of universal indicator Explaining: pH probe and universal each and stand and pH meters to determine the pH of a white card indicator a solution. Have prepared a set of test tubes behind the rack Describe solutions as being more or with solutions of different pHs. Add so students can less acidic/alkaline by comparing their indicator to each and stand a white see the colours pHs. card behind the rack so students can easily. Ask Exceeding see the colours easily. Ask them to them to refer to Use information indicator colour refer to pH charts to work out the pH pH charts to changes to design different indicators of the contents of each tube, and work out the pH for different purposes. then use a pH probe and datalogger of the contents to measure the pH. of each tube, and then use a Plenary: Thinking skills pH probe and Odd One Out: 1, 8, 14. (Possible datalogger to answers: 1 is the only pH number measure the that is an acid; 8 is the only number pH. that represents a less hazardous/dangerous/powerful substance.) Lesson 7Fd: Neutralisation Learning objectives Exemplar teaching activities Differentiation Resources Maths skills Practical skills Developing Starter: Making the spill safe Explaining: Resources Reading and Students Recall that react with alkalis and 'Spill' some acid into a wide shallow Following from 7Fd plotting line investigate how this is called neutralisation. container. Use indicator (liquid or neutralisation Exploring graphs. pH changes Explain how chemical reactions are paper) to show that the liquid is Prepare graphs Science. when an acid is different to physical changes. acidic. 'Cancel' the acidity by adding and challenge diluted and Interpret a word equation to identify sodium hydroxide solution. Show that students to state when it is the products and reactants in a any remaining liquid is now neutral. what must have neutralised. chemical reaction. happened to Universal Recall some applications of Exploring: Changing the pH cause any indicator or pH neutralisation (changing the pH of Students investigate how pH changes changes in pH meters can be soils). when an acid is diluted and when it is shown. used. Supply missing reactants or products neutralised. Universal indicator or pH to complete a word equation. meters can be used. Students can Use a pH probe Securing plot a graph of their results. and a
Describe the use of universal indicator and pH meters to determine the pH of a solution. Describe solutions as being more or less acidic/alkaline by comparing their pHs. Exceeding Use information indicator colour changes to design different indicators for different purposes. Explaining: pH probe and universal indicator Have prepared a set of test tubes with solutions of different pHs. Add indicator to each and stand a white card behind the rack so students can see the colours easily. Ask them to refer to pH charts to work out the pH of the contents of each tube, and then use a pH probe and datalogger to measure the pH. Plenary: Thinking skills Odd One Out: 1, 8, 14. (Possible answers: 1 is the only pH number that is an acid; 8 is the only number that represents a less hazardous/dangerous/powerful substance.) each and stand a white card behind the rack so students can see the colours easily. Ask them to refer to pH charts to work out the pH of the contents of each tube, and then use a pH probe and datalogger to measure the pH. Lesson 7Fd: Neutralisation Learning objectives Exemplar teaching activities Differentiation Resources Maths skills Practical skills Developing Recall that react with alkalis and this is called neutralisation. Explain how chemical reactions are different to physical changes. Interpret a word equation to identify the products and reactants in a chemical reaction. Recall some applications of neutralisation (changing the pH of soils). Supply missing reactants or products to complete a word equation. Securing Starter: Making the spill safe 'Spill' some acid into a wide shallow container. Use indicator (liquid or paper) to show that the liquid is acidic. 'Cancel' the acidity by adding sodium hydroxide solution. Show that any remaining liquid is now neutral. Exploring: Changing the pH Students investigate how pH changes when an acid is diluted and when it is neutralised. Universal indicator or pH meters can be used. Students can plot a graph of their results. Explaining: Following neutralisation Prepare graphs and challenge students to state what must have happened to cause any changes in pH shown. Resources from 7Fd Exploring Science. Reading and plotting line graphs. Students investigate how pH changes when an acid is diluted and when it is neutralised. Universal indicator or pH meters can be used. Use a pH probe and a
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