Exhibit 15-3 Ephedrine (C₁₀H₁₅ON), a Central Nervous System Stimulant, Is

Exhibit 15-3 Ephedrine (C₁₀H₁₅ON) , a central nervous system stimulant, is used in nasal sprays as a decongestant. This compound is a weak organic base :
C₁₀H₁₅ON (aq) + H₂ O HC₁₀H₁₅ON + (aq) + OH - (aq) Consider a 0.035 M
Solution of ephedrine that has a pH of 11.33 to answer the following problem(s) .
-Refer to Exhibit 15-3. What is the base ionization constant , K b , for the dissolution of ephedrine in water?

A) 6.3×10 ^{- 22}
B) 7.5×10 ^{- 11}
C) 1.3×10 ^{- 4}
D) 2.1×10 ^{- 3}
E) 6.4×10 ^{- 2}