A 1.00 g pill contains morphine (M = 285.34), a monobasic compound whose conjugate acid has pKa = 8. — Laboratory Chemistry Question
Question
A 1.00 g pill contains morphine (M = 285.34), a monobasic compound whose conjugate acid has pKa = 8.21, in addition to an unknown amount of inert material. To analyze the morphine content of the pill, it is dissolved in 50.0 mL 0.1000 M aqueous HCl and the unreacted acid in the resulting solution back-titrated with 0.1000 M NaOH. Which of the following statements about this experiment are correct?
I. If the pill contains only morphine, the titration will require 35.0 mL NaOH solution to reach the endpoint.
II. Methyl red, which changes color from red to yellow between pH = 4.4 and pH = 6.2, would be a suitable indicator for this titration.
A.
I only
B.✓ Correct
II only
C.
Both I and II
D.
Neither I nor II
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