An aqueous acid–base titration is expected to have an equivalence point at pH 8.3
CHEMISTRY · Single correct · A Level · Chemistry · Acids and bases · Acids and bases
Problem
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