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
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