Buffer Solutions | Complete Lesson A2 Chemistry (scan for video preview)

What is buffer solution definition? Buffer systems in the body? How are buffer systems used in food? Henderson-Hasselbalch equations? All this and more covered in this comprehensive lesson with questions and answers! This is a Year 13 A level lesson for Edexcel International Unit 4 – WCH14, but it can also be used for all UK exam boards.

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 your lessons by simply changing the questions and the answers each time.
Slide 2 - Lesson objectives (see thumbnail image)
Slide 3 – definition of buffer solutions
Slides 4 – 5: this section explains what an acidic buffer solution is, how they are made and what acidic buffer solutions contain
Slides 6 – 7: same as above, but for alkaline buffer solutions
Slides 8 – 10: use this section to explain how acidic buffer solutions work, including what happens when a little acid or alkali is added to the solution
Slides 11 – 13: use this section to explain how alkaline buffer solutions work, including what happens when a little acid or alkali is added to the solution
Slide 14 - learning pit stop to help students embed their learning so far. Answers appears on the screen as you click.
Slides 15 – 16: use this section to present students to the methods to calculate the pH of a buffer solution. The Henderson-Hasselbalch equation is shown here, but students are under no obligation to use it if they are confident rearranging the acid dissociation expression
Slides 17 – 24: three worked examples of increasingly difficult buffer calculations. The working out appears on the screen in sequence as you click. You can print the questions for your students by using the hidden slides
Slide 25 - learning pit stop to help students embed their learning so far. Answers appears on the screen as you click.
Slides 26 – 27: a fourth worked example which requires students to find the proportions of acid and alkali needed to make a buffer solution of particular pH
Slide 28 - learning pit stop to help students embed their learning so far.
Slides 29 – 37: in this section, students are presented to buffer systems in the body. The Apollo 13 movie is used as a hinge to introduce students to the dangers of excess carbon dioxide in the blood. The reactions involved in the carbonic acid buffer system are explained in detail
Slide 38 – use this slide to explain to students how buffers in food work to prevent bacterial growth
Slides 39 – 44: Exam questions with mark scheme answers (included with the resource)

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