I'm looking at Exam 3 from Winter 2006, and for question 5, shouldn't K2SO3 be the one being added to HClO4 since it is stonger?
Perchloric acid {HClO4(aq)} is probably one of the strongest acids we'll consider, so it's pretty safe to say that any titration involving perchloric acid will have the perchloric acid in the buret.
Again, when you are setting up a titration it is always preferable to have a something strong and monoprotic in the buret.
Other questions, let me know, I'll answer them to the blog as soon as I see them...
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