write different types of indicator and explain any one
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Methyl orange is an acid base indicator that turns red in acidic solution and yellow in base, the mid-point colour is orange.
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Indicator pKa Useful range
Methyl red 5.1 4.2 - 6.3
Bromothymol blue 7.0 6.0 - 7.6
Phenol red 7.9 6.8 - 8.4
Phenolphthlein 9.3 8.2 - 10.0
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An indicator prepared from natural substances is known as natural indicator. Examples are Litmus, Turmeric, China rose petals, snowball plant, Red Cabbage and Grape Juice… . An indicator prepared from artificial substances is known as synthetic indicator Examples are Phenolphthalein and Methyl Orange.
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