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Bromothymol blue, ka=1. 6×10−7 , is yellow in its protonated form ( hx ) and blue in its ionized form ( x− ). At what ph will bromothymol blue be a perfect green color?.

Respuesta :

The pH at which bromothymol blue be a perfect green color is; pH = 6.8

What is the PH?

For Bromothymol, as HX is yellow and X⁻ is blue, the indicator will be a perfect green color when HX = X⁻.

From Henderson-Hasselbalch formula, we known that:

pH = pka + log [X⁻]/[HX] (1)

Where pka = -log ka = -log(1.6 × 10⁻⁷) = 6.8

Since HX = X⁻, [HX]/[X⁻] = 1

Thus;

pH = 6.8 + log 1

pH = 6.8 + 0

pH = 6.8

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