Today I finished the solubility unit by discussing the Group II/Group III selective precipitation by analyzing the pH at which the sulfides precipitate out in solution. The Group II cations precipitate at a low pH, while the Group III cations precipitate out at a higher pH. I performed an example for FeS(s) and the pH at which every other cation in Group II and Group III can be calculated in a similar fashion (see questions 77-79 on the solubility work on Carmen).
The last type of problem I covered in the solubility unit was a problem asking about the order in which precipitate drop out of solution when a precipitating agent is added slowly (or dropwise) to a solution containing more than one cation/anion. This will allow you to complete questions 64-71 on the Carmen homework set.
I started to briefly cover the transition metal unit by looking at the oxidation states and d electron counts of transition metal complexes. If you are rusty in electron configurations be sure to look them over, as they will be vital in understanding transition metal complexes.
Songs Played Before Class:
Counting Crows - Mr. Jones
Eminem feat Rihanna - Love the way you lie
Inspiration Quote of the Day:
“I don’t want to come home and look in the mirror and think the reason I didn’t do well was because I didn’t prepare.”
2008 World Series Champion Chase Utley
Go Phillies!
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