If we will analyze the graph and the given info, we can see that equivalence point is at 3.2
The titration shown here has an equivalence point at pH = 3.2. Identify which of the following indicators would be appropriate for this titration. Check all that apply.
a. metacresol purple pKa = 1.51, 8.32
b. ethyl red pKa = 5.42
c. quinaldine red pKa = 2.63
d. bromothymol blue pKa = 7.0
e. phenolphthalein pKa = 9.50
f. thymol blue pKa = 1.65, 9.20
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Based on our data, we think this problem is relevant for Professor Thyagarajan's class at JHU.