solution is prepared that contains 12.5 mL propylamine (CH3CH2CH2NH2, d = 0.719 g/mL, 59.11 g/mol, Kb = 3.5x10^-4 and 15.00 g of propylamine hydrochloride (CH3CH2CH2NH3Cl, 95.57 g/mol) dissolved in a total volume of 725 mL. PrNH2 (aq) + H2O (l) PrNH3+ (aq) + OH- (aq) a. Calculate the pH of this buffer. b. Calculate the pH of the final solution if 12.0 mL of 0.125 M HCl is added to 50.0 mL of the buffer. c. Calculate the pH of the final solution if 15.0 mL of 0.20 M HCl is added to 50.0 mL of the buffer.
solution is prepared that contains 12.5 mL propylamine (CH3CH2CH2NH2, d = 0.719 g/mL, 59.11 g/mol, Kb = 3.5x10^-4 and 15.00 g of propylamine hydrochloride (CH3CH2CH2NH3Cl, 95.57 g/mol) dissolved in a total volume of 725 mL. PrNH2 (aq) + H2O (l) PrNH3+ (aq) + OH- (aq) a. Calculate the pH of this buffer. b. Calculate the pH of the final solution if 12.0 mL of 0.125 M HCl is added to 50.0 mL of the buffer. c. Calculate the pH of the final solution if 15.0 mL of 0.20 M HCl is added to 50.0 mL of the buffer.
Chapter7: Solutions And Colloids
Section: Chapter Questions
Problem 7.107E
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Question
A solution is prepared that contains 12.5 mL propylamine (CH3CH2CH2NH2, d = 0.719 g/mL, 59.11 g/mol,
Kb = 3.5x10^-4 and 15.00 g of propylamine hydrochloride (CH3CH2CH2NH3Cl, 95.57 g/mol) dissolved in a
total volume of 725 mL.
PrNH2 (aq) + H2O (l) PrNH3+ (aq) + OH- (aq)
a. Calculate the pH of this buffer.
b. Calculate the pH of the final solution if 12.0 mL of 0.125 M HCl is added to 50.0 mL of the buffer.
c. Calculate the pH of the final solution if 15.0 mL of 0.20 M HCl is added to 50.0 mL of the buffer.
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