Make a table of acids and bases with onion,vinegar and clove olfactory indicators changes in smell.
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Explanation:
Indicator Original colour Acid. Ba. eric Yellow No change Reddish brown
Red cabbage juice Purple Reddish Greenish yellow
Phenolphthalein Colourless Colourless Pink
Methyl orange Orange Red Yellow
Onion n/a No change Smell vanishes
Vanilla n/a No change Smell vanishes
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