EOC Exercise 17.68 (13th & 14th ed) - correction to solutions manual

[Zellmer, Robert]

Someone asked about problem 17.68 in the 13th & 14th eds. (17.66 in 12th ed.,
17.62 in 11th ed., 17.60 in 10th ed).  The solution manual adds 3 equations
together to get an eqn and then add H+ to both sides to get the actual
final eqn.  However, when they did this they didn't do it as adding another
reaction eqn and accounting for the K for this added reaction.

It should have been done by adding a 4th eqn, the reverse of the self-ionization
eqn for H2O and including 1/Kw in the final calculation for the K. I've corrected
it the best I could by editing a PDF file and attached that.

Dr. Zellmer
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