Page 2 - 3. LESSON NOTES-(INDICATIRS OF ACIDS & BASES)
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B. Indicators- Acids & Bases can be identified using appropriate
indicators.
Natural Indicators
Colour indicators Olfactory Indicator Synthetic Indicator
1.Litmus (Lichen) 1. Onion extract 1. Phenolphthalein
2. Red Cabbage 2. Vanilla extract 2. Methyl Orange.
3. Turmeric 3. Clove Oil 3. Universal indicator
Indicator Colour Chart-
Indicator Colour in Acid Colour in Base
1. Litmus Red Blue
2. Phenolphthalein Colourless Pink
3. Methyl Orange Red Yellow
4. Turmeric No change Red
5. Red Cabbage Red Green
6. Onion Extract No effect on smell of Onion smell is lost
onion
7. Clove oil No effect on smell of Clove oil smell is lost.
Clove oil
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