reacts with a strong base using pH charts, or pH meter, or pH choose a suitable indicator June 2005 Unit 5 and when a strong acid probe on a data logger; AT d, k, a). for acid-base titrations. Question 2 reacts with a weak base. (QS05.5.02) Sketch pH curves for given acid and base combinations, and choose a June 2003 Unit 4 suitable indicator (AO2 - Apply Question 3 knowledge and understanding). (QW03.4.03) Extension Write spreadsheets to calculate the pH during a titration and to plot the pH curve (AO2 - Apply knowledge and understanding) 3.1.12.6 Buffer action Time Learning activity with opportunity to Assessment Learning outcome Resources Learning objective taken develop skills opportunities Know what buffer solutions 0.6 Sandcastles & mudhuts Describe how buffer solutions are January 2013 Unit 4 – Students should be able to: are, how they are made weeks made, how they work and what they Question 2 buffering action in blood describe what a buffer and what they are used for. are used for (AO2 - knowledge (QW13.4.02) (Hancock) ISBN solution is and how it is and understanding). January 2011 Unit 4 9780340543696 made Explain how acidic and Calculate the pH of a buffer solution Question 2 explain qualitatively how basic buffer solutions work. given details about quantities of the (QW11.4.02) Some suitable problems acidic/basic buffer reagents it is made from, and Specimen solutions work can be found at and Calculate the pH of acidic changes in pH when small amounts Paper Question 4 buffer solutions. (subscription required) know some uses of buffer of acid/alkali are added to buffer (QSP 4.04) solutions solutions (AO2 - Apply knowledge January 2005 Unit 4 calculate the pH of a buffer and understanding; MS0.4 - Use Question 8 solution. calculators to find and use power, (QW05.4.08) exponential and logarithmic January 2002 Unit 4 functions; MS2.5 - Use logarithms in Question 3 relation to quantities that range over (QW02.4.03) several orders of magnitude). Students could prepare a solution of a specific pH and then test the
reacts with a strong base and when a strong acid reacts with a weak base. choose a suitable indicator for acid-base titrations. using pH charts, or pH meter, or pH probe on a data logger; AT d, k, a). Sketch pH curves for given acid and base combinations, and choose a suitable indicator (AO2 - Apply knowledge and understanding). June 2005 Unit 5 Question 2 (QS05.5.02) June 2003 Unit 4 Question 3 (QW03.4.03) Extension Write spreadsheets to calculate the pH during a titration and to plot the pH curve (AO2 - Apply knowledge and understanding) 3.1.12.6 Buffer action Learning objective Time taken Learning outcome Learning activity with opportunity to develop skills Assessment opportunities Resources Know what buffer solutions are, how they are made and what they are used for. Explain how acidic and basic buffer solutions work. Calculate the pH of acidic buffer solutions. 0.6 weeks Students should be able to: describe what a buffer solution is and how it is made explain qualitatively how acidic/basic buffer solutions work know some uses of buffer solutions calculate the pH of a buffer solution. Describe how buffer solutions are made, how they work and what they are used for (AO2 - knowledge and understanding). Calculate the pH of a buffer solution given details about quantities of the reagents it is made from, and changes in pH when small amounts of acid/alkali are added to buffer solutions (AO2 - Apply knowledge and understanding; MS0.4 - Use calculators to find and use power, exponential and logarithmic functions; MS2.5 - Use logarithms in relation to quantities that range over several orders of magnitude). Students could prepare a solution of a specific pH and then test the January 2013 Unit 4 Question 2 (QW13.4.02) January 2011 Unit 4 Question 2 (QW11.4.02) Specimen Paper Question 4 (QSP 4.04) January 2005 Unit 4 Question 8 (QW05.4.08) January 2002 Unit 4 Question 3 (QW02.4.03) Sandcastles & mudhuts – buffering action in blood (Hancock) ISBN 9780340543696 Some suitable problems can be found at and (subscription required)
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