Chemistry Practice Problems Weak Bases Practice Problems Solution: Morphine is a weak base. A 0.150 M solution of mor...

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Solution: Morphine is a weak base. A 0.150 M solution of morphine has a pH of 10.5.What is Kb for morphine?

Problem

Morphine is a weak base. A 0.150 M solution of morphine has a pH of 10.5.

What is Kb for morphine?

Solution

We are being asked to calculate the Kb for a 0.150 M solution of morphine (C17H19NO3)

Morphine (C17H19NO3) is a neutral amine, therefore we know that it is a weak base.


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:

C17H19NO3weak baseproton acceptor
H2O → will act as the weak acidproton donor


Equilibrium reaction:       C17H19NO3(aq) + H2O(l)  C17H19NO3H+(aq) + OH-(aq)

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