20 mL of an approximately 10% aqueous solution of ethylamine, CH3CH2NH2, is titrated with 0.3000 M a — Acids and Bases Chemistry Question
Question
20 mL of an approximately 10% aqueous solution of ethylamine, CH3CH2NH2, is titrated with 0.3000 M aqueous HCl. Which indicator would be most suitable for this titration? The pKa of CH3CH2NH3+ is 10.75.
A.
Thymol blue, color change from pH = 1.2 to 2.8
B.✓ Correct
Bromocresol green, color change from pH = 4.0 to 5.6
C.
Phenolphthalein, color change from pH = 8.0 to 10.0
D.
Alizarin yellow R, color change from pH = 10.0 to 12.0
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