Lesson 1 of 14
Three groups, and no tasting
Show on a big screenA jar has no label. Do not taste it, because an unknown substance may harm you. Read the strips instead.
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The idea
Litmus comes from lichens, small growths on tree bark and rocks. It comes as blue paper and red paper. The groups are acidic, basic and neutral. Neutral means neither acidic nor basic. Litmus shows the group by changing colour. So it is an acid-base indicator.
| The strips did this | The group |
|---|---|
| Blue litmus turned red | Acidic |
| Red litmus turned blue | Basic |
| Neither one changed | Neutral |
Step 1 of 4
- A jar with no label. A teacher does the test.
- The teacher mixes a little into clean water.
- A drop goes on a strip. It may change colour.
- Read the colour. Write the group.
Never taste an unknown substance. Test it with litmus paper.
Try the lab to finish this lesson.