March 28, 2017

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Calculate the pH of the solute in an aqueous solution of 0.0047 M codeine, if the pKa of itsconjugate acid is 8.21.
What is the percentage protonation of the solute?

  • chemistry - ,

    If we all codeine, C, then the hydrolysis is
    C + HOH ==> HC^+ + OH^-
    Kb = (Kw/Ka) = (OH^-)^2/(C)
    Substitute into the Kb expression and solve for OH^-, convert to pOH, then to pH.

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