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What is a standard solution? What is a good primary standard? What is weighing by difference? What is hygroscopic? What is a method for making a standard solution? All this and more covered in this comprehensive lesson with questions and answers! This is a Year 12 A level lesson for Edexcel International Unit 2 – WCH12, but it can also be used for all UK exam boards. All the slides in this lesson are fully animated and include answers to every mini plenary question and exam question. The breakdown of the slides (which are best opened on Microsoft PowerPoint) is as follows:

Slide 1 - Title and 5-minute starter. The starter is a grid of four questions entitled ‘last week, last lesson, today’s learning and future learning’. Use this generic slide for all of your lessons by simply changing the questions and the answers each time.
Slide 2 - Lesson objectives (see thumbnail image)
Slide 3 – Hinge question: When performing a titration, where is the solution of known concentration kept? Answer animates onto the screen (the burette)
Slide 4 – a solution with a known concentration is called a standard solution (leading on from the previous slide)
Slides 5 – 6: Students presented with the definition of a primary standard and what makes a good primary standard
Slides 7 – 8: prepare to blow your students’ minds by telling them that sodium hydroxide is not a good primary standard! This is explained fully on slide 8
Slides 9 – 13: Students will be taught two important steps in making a standard solution: Calculating roughly how much of your primary standard to weigh and Weighing by difference. There are examples of each of these skills on the slides
Slides 14 – 17: students will now make their own standard solution! If they are not using their core practical books, they can use the apparatus list, chemicals list and method included with this resource and embedded within the PowerPoint
Slides 18 – 19: Students are instructed to calculate the concentration of their standard solution. There is an example calculation on slide 19 which shows how them to do this
Slides 20 – 22: Exam questions with mark scheme answers (included with the purchase of this resource)

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