An aqueous acid–base titration is expected to have an equivalence point at pH 8.3. Which indicator from the list below would be the best choice for signaling the endpoint?
• Bromothymol blue, pKa = 7.1
• Cresol red, pKa = 8.2
• Phenolphthalein, pKa = 9.3
• Methyl orange, pKa = 3.7
a) Phenolphthalein
b) Cresol red
c) Bromothymol blue
d) Methyl orange