Weak Bases (Section)
Ephedrine, a central nervous system stimulant, is used in nasal sprays as a decongestant. This compound is a weak organic
base:
C10H15ON(aq) + H2O(l) ⇌ C10H15ONH+(aq) + OH-(aq)
A 0.035 M solution of ephedrine has a pH of 11.33. (a) What are the equilibrium concentrations of C10H15ON, C10H15ONH+, and OH-? (b) Calculate Kb for ephedrine.
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