Question

what will be the colour change in the titration flask at the end point using methyl orange as an indicator in Na2co3 and Na2hco3 mixture of solution​

Answer 1

Answer:

Golden yellow to reddish pink.

Explanation:

In the estimation of carbonate-bicarbonate mixture, two indicators are used. Phenolphthalein and methyl orange. To a 20 ml solution containing mixture of carbonate+bicarbonate, phenolphthalein is added and titrated against standard HCl till the color changes from pink to colorless. End point is noted down. Then methyl orange is added  and the titration is continued till the color changes from golden yellow to reddish pink.