We are being asked to calculate the Kb for a cocaine solution of which has a pH of 8.53 and an osmotic pressure of 52.7 torr at 15°C.
Cocaine is a weak organic base whose molecular formula is C17H21NO4.
Since we’re dealing with a weak base and Kb is an equilibrium expression, we will have to create an ICE chart to determine the equilibrium concentration of each species:
• C17H21NO4 → weak base → proton acceptor
• H2O → will act as the weak acid → proton donor
Equilibrium reaction: C17H21NO4(aq) + H2O(l) ⇌ C17H21NO4H+(aq) + OH-(aq)
Cocaine is a weak organic base whose molecular formula is C17H21NO4. An aqueous solution of cocaine was found to have a pH of 8.53 and an osmotic pressure of 52.7 torr at 15 oC.
Calculate Kb for cocaine.
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