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In a titration of NaOH and Na2CO3 mixture with HCl. Using 2 indicators phenolphthalein and bromocresol...

In a titration of NaOH and Na2CO3 mixture with HCl. Using 2 indicators phenolphthalein and bromocresol green. Why didn’t we use thymol blue instead of phenolphthalein since they have the same ph range

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Although both phenolpthalein and thymol blue are the pH indicators with same range. Phenolpthalien id colourless in acidic and pink coloured in Alkaline. where as thymol blue is red in strongly acidic yellow upto pH 8 and Blue above pH 8. in case of bromocresol green it is also yellow below pH 3 and blue above pH 5. hence it we use Bromocresol green and Thymol blue we wont be able to find any colour change near the equivalence point nor would be we able to find the difference between acid and bicarbonate part.

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