Ionic equilibrium

Chemistry Level 3

Bromophenol blue is an indicator with a ka value of 5.84* 10^-5. What percentage of this indicator is in its basic form at a pH of 4.87?

34.5 % 70 % 80 % 65.4 %

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1 solution

Suhas Sheikh
Jun 16, 2018

Using pH=pKA + {In(-)}/{HIn} We easily get the ratio as 4.32 Yielding % of In(-) Basic form of indicator present as 80.32% approx

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