(Answered) Ephedrine a central nervous stimulant is used in nasal

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Ephedrine , a central nervous stimulant, is used in nasal sprays as decongestant. This compound is a weak organic base:

C10H15ON(aq) + H2O(l) <--> C₁₀H₁₅NOH⁺(aq) +OH^-(aq) K_b has the value of 1.4 x 10^-4. What pH would you expect for 0.035 M solution of ephedrine, assuming that no other substances are present? What is the value of pK_afor the conjugate acid of ephedrine?

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