Tell the learners that they have gained a lot of knowledge about litmus paper, acids, bases and neutrals.
Mention that other indicators can also be used, especially in laboratories, e.g. Bromothymol blue, Methyl orange and a Universal Indicator.
Present an overview of acid base indicators by using Presentation 3: Acid base Indicators.
Learner Activity 5
Complete Worksheet C: Acid and base indicators.
Teacher to use Worksheet C: Memorandum to mark the learners’ work.
Complete Worksheet D: The learners work in groups and they must test the different household substances within a specified time in the classroom. Correct recordings must be written in the appropriate columns.
Teacher to use Worksheet D: Memorandum to mark the learners’ work.
Revision Activity 1
Learners complete QUIZ 1.
Teacher to use QUIZ 1: Memorandum to mark the learners’ work.
Revision Activity 2
Learners complete QUIZ 2.
Teacher to use QUIZ 2: Memorandum to mark the learners’ work.