PS keys posted

The problem sets and keys from this week are posted on my mnstate.edu web page. Let me know of you have questions.

Also a note, you should know strong acids and strong bases, there aren't many of them.

Strong acids: perchloric, nitric, sulfuric (first Ka), hydrochloric, hydrobromic, hydroiodic

Strong bases: any soluble hydroxide (alkaline metal hydroxides, somewhat alkaline earth hydroxides) that can be at least ~1M. {Look at Ksp...}

If it's not one of these "strong" species, you can probably assume that it's weak, unless something in the problem tells you otherwise. For example, if you are told that an acid has a Ka = 200, it's strong even if it doesn't appear on "the list".