A student titrates 25.0 mL of 0.100 M HCl with 0.100 M NaOH at 25 °C
CHEMISTRY · Single correct · A Level · Chemistry · Acids and bases · Acids and bases
Problem
A student titrates 25.0 mL of 0.100 M HCl with 0.100 M NaOH at 25 °C. The student may choose one of the following indicators:
• Methyl red, pKa = 5.0
• Bromothymol blue, pKa = 7.1
• Phenolphthalein, pKa = 9.3
• Thymol blue (first transition), pKa = 1.5
Which indicator would provide the most accurate detection of the equivalence point?
(a) Methyl red
(b) Phenolphthalein
(c) Bromothymol blue
(d) Thymol blue