We are asked to determine the pKa of bromcresol green given that its blue and yellow form exists at pH 4.68.
In this problem, we are given equal concentrations of the blue (acid) and yellow (base) forms of bromcresol green (i.e. the indicator is at its equivalence point).
Recall that at equivalence point:
The acid-base indicator bromcresol green is a weak acid. The yellow acid and blue base forms of the indicator are present in equal concentrations in a solution when the pH is 4.68.
What is the pKa for bromcresol green?
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What scientific concept do you need to know in order to solve this problem?
Our tutors have indicated that to solve this problem you will need to apply the Acid Base Indicators concept. If you need more Acid Base Indicators practice, you can also practice Acid Base Indicators practice problems.
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