Problem: Codeine (Cod), a drug used in pain killers and cough medicine, is a naturally occurring amine that has a Kb = 1.6 ×10–6. What is the pH of a 0.0012 M solution of codeine?A. 8.45 B. 4.80 C. 10.25 D. 9.64 E. 4.36

FREE Expert Solution

We are being asked to calculate the pH for a 0.0012 M solution of codeine (Cod)


Codeine (Cod) has a low Kb, 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:

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


Equilibrium reaction:        Cod(aq) + H2O(l)  CodH+(aq) + OH-(aq)

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Problem Details

Codeine (Cod), a drug used in pain killers and cough medicine, is a naturally occurring amine that has a Kb = 1.6 ×10–6. What is the pH of a 0.0012 M solution of codeine?

A. 8.45 

B. 4.80 

C. 10.25 

D. 9.64 

E. 4.36

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Weak Bases concept. If you need more Weak Bases practice, you can also practice Weak Bases practice problems.