Question

What color would a bromocresol green solution be at ph=7 ?

Answer 1

Bromocresol Green belongs to a class of dyes called as Sulfonephthaleins. This dye imparts different colours at different pH's.

Colors at different pH:
                                   Bromocresol Green has a transition pH range between 3.8 and 5.4.

Color Below pH 3.8:
                                Bromocresol Green imparts Yellow color below pH 3.8.

Color Above pH 5.4:
                                Bromocresol Green imparts Blue color above pH 5.4.

Due to different colors at different pH this compound is used at Indicator in quantitative analysis techniques like Titration.

Result:
           Bromocresol Green will give Blue color at pH 7.