Explanation Here, according to the given question Amphetamine is a base. We can say that Amphetamine dissociates in water according to the reaction C 9 H 13 N ( a q ) + H 2 O ( l ) ↔ C 9 H 13 N H + ( a q ) + O H − ( a q ) Now, since pK b for the reaction is given we can calculate the K b (dissociation constant) for the reaction. Now using the concentration of Amphetamine and molar mass of Amphetamine, we can calculate the molarity of Amphetamine. We can calculate the [ OH − ] by constructing the ICE table. After calculating [ OH − ] we can calculate the pOH using the logarithmic table. Finally we can calculate the pH using the pOH value. Given: pK b for Amphetamine is 4.2 Concentration of Amphetamine is 225 mg/L Formula used: Molar mass can be calculated by adding the atomic mass of all the elements The dissociation constant K b can be calculated by pK b = -log K b K b = 10 pK b Molarity can be calculated using the formula M o l a r i t y = C o n c e n t r a t i o n ( m g L ) M o l a r m a s s × 1000 The relation between dissociation constant K b and equilibrium concentration is K b = [ P r o d u c t ] [ R e a c t a n t ] The pOH can be calculated as pOH = -log[ OH − ] The pH can be calculated as pH + pOH = 14 Calculation: Here, pK b = 4.2 pK b = -log K b K b = 10 −pK b K b = 10 −4.2 K b = 0.000063 For Amphetamine ( C 9 H 13 N ) Atomic mass of C = 12 g/ml Atomic mass of H = 1 g/ml Atomic mass of N = 14 g/ml Molar mass of C 9 H 13 N = (1×9)+(1×13)+14 = 135 g/ml M o l a r i t y = C o n c e n t r a t i o n ( m g L ) M o l a r m a s s × 1000 M o l a r i t y = 225 m g L 135 g / m o l × 1000 Molarity = 0...

Chemistry: Structure and Properties Custom Edition for Rutgers University General Chemistry

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ISBN: 9781269935678

Author: Nivaldo J. Tro

Publisher: Pearson Education

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Chapter 17, Problem 94E

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The pH of a solution containing a Amphetamine concentration of 225 mg/L

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Chapter 17, Problem 93E

Chapter 17, Problem 95E

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Chemistry: Structure and Properties Custom Edition for Rutgers University General Chemistry

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To determine:

The pH of a solution containing a Amphetamine concentration of 225 mg/L