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B. Indicators- Acids & Bases can be identified using appropriate
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Natural Indicators
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Colour indicators Olfactory Indicator SSynthetic Indicator
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1.Litmus (Lichen) 1. Onion extract 1. Phenolphthalein2. Red
1 . L i t m u s ( L i ch e n ) 1 . O n i o n e x t r a ct 1 . P h e n o l p h t h a l e i

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Cabbage 2. Vanilla extract 2. Methyl Orange.
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3 . T u r m e r i c 3 . C l o v e O i l 3 . U n i v e r sa l i n d i ca t o r
3. Turmeric 3. Clove Oil 3. Universal indicator

Indicator Colour Chart-
Colour in Base
Indicator Colour in Acid C o l o u r i n B a s e
1. Litmus Red Blue
2. Phenolphthalein Colourless Pink
3. Methyl Orange Red Yellow
4. Turmeric No change Red
5. Red Cabbage Red Green
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6. Onion Extract No effect on smell of Onion smell is lost
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7. Clove oil No effect on smell of Clove oil smell is lost.
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Clove oil
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