Problem 16.73 Ephedrine, a central nervous system stimulant, is used in nasal sprays as a decongestant. This...

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Answer â€“ Given, [C₁₀H₁₅ON] = 0.035 M , pH = 11.33

We know,

pH + pOH = 14

so, pOH = 14- pH

Â Â Â Â Â Â Â Â Â Â Â Â Â = 14- 11.33

Â Â Â Â Â Â Â Â Â Â Â Â Â = 2.67

So, [OH^-] = 10^-pOH

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â = 10^-2.67

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â = 0.00214 M

Â Â We know

Â Â C₁₀H₁₅ON + H₂O ------> C₁₀H₁₅ONH⁺ + OH^-

IÂ Â 0.035Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0

C -xÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â +xÂ Â Â Â Â Â Â Â Â Â Â Â Â +x

E 0.035-xÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â +xÂ Â Â Â Â Â Â Â Â Â Â Â Â Â +x

We know, at equilibrium, [OH^-] = x = 0.00214 M

Part A) [C₁₀H₁₅ON] = 0.035 -x

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â = 0.035-0.00214

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â = 0.033 M

Part B)

We know, [C₁₀H₁₅ONH⁺] = x = 0.0021 M

Part C) , [OH^-] = x = 0.0021 MÂ Â Â Â

Part D)

Kb = [C₁₀H₁₅ONH⁺][OH^-] / [C₁₀H₁₅ON]

Â Â Â Â Â = 0.00214 *0.00214 / 0.033

Â Â Â Â Â Â = 1.4* 10^-4

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