TITRATION CALCULATIONS & PRACTICAL - QUANTITATIVE CHEMISTRY
This lesson is designed for the NEW AQA Trilogy Chemistry GCSE, particularly the ‘Chemical calculations’ SoW and specifically designed for higher tier GCSE chemistry students.
The lesson starts with students learning how to calculate the concentration of a solution in mols/dm3 when you know the mass of the solute in the solution. Students learn the steps necessary to complete this calculation, they can then complete a set of problems. This work can be self-assessed using the answers provided in the PowerPoint presentation.
Students are then asked to discuss how they might work out the mass of a solute in a solution when they know the volume and concentration of a solution. After a short class discussion, the PowerPoint reveals four steps students should work their way through when approaching a problem such as this one. Students are then given two further problems to have a go at, they should show their working at each step of the calculation. Answers to the questions, as well as working out, is included in the PowerPoint presentation.
Students are then given a worksheet, including a worked example of how to use a titration to calculate the concentration of a unknown substance. Using the worked example as a guide, students should attempt to answer the questions on the worksheet. For lower ability students it will be worth going through the worked example on the board first, those very able students should be able to use the worked example as a guide when answering the other questions
Once this task has been completed students should self-assess their work using the mark scheme provided.
The last task is a titration practical, their is a worksheet included in the PowerPoint for students to use as guide when completing the practical - including an aim, equipment list, method and results table.
Once they have completed the investigation they should be able to use the balanced symbol equation to calculate the concentration of sulfuric acid used in this titration.
The plenary task is for pupils to write down 3 key words, 2 facts and a question to test their peers on what they have learned today.
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