What are indicators ?Name any three indicators and state their colour change. Which take place in :a)acidic medium b)basic medium?
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1) a gauge or meter of a specified kind.
2) a thing that indicates the state or level of something.
=> Indicator Range
Indicator Colour pH range
Bromothymol Blue yellow 6.0 - 7.6
Phenol Red yellow 6.8 - 8.4
Thymol Blue - 2nd change yellow 8.0 - 9.6
Phenolphthalein colourless 8.2 - 10.0
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