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:
• Cod → weak base → proton acceptor
• H2O → will act as the weak acid → proton donor
Equilibrium reaction: Cod(aq) + H2O(l) ⇌ CodH+(aq) + OH-(aq)
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?
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