Tuesday, February 27, 2007
Welcome back y'all
I hope that you all have recharged your batteries and are ready to excel for the rest of the second half.
AP: today we covered weak bases and polyprotic acids. The main things to watch out for are:
when you solve for "x" in a weak base problem, you are solving for the HYDROXIDE concentration so be careful when the question asks you for the pH, not the pOH.
when you do the second ionization step in a polyprotic acid calculation, don't forget that your INITIAL concentrations will NOT be zero for the H+ and for the anion, HA-, that resulted from the first step!
Plenty of practice files are up now to help you practice for Friday's test.
Honors: we covered the best of nuclear in a day. I will tie up some loose ends tomorrow. I was impressed that you all seemed to be on top of what I was discussing with you. Cheers.
Regents: we revisited some mole-mole and mole-liter and mole-mass calculations and then went on to our next subtopic: Solutions. We will dig into more of those problems tomorrow.
AP: today we covered weak bases and polyprotic acids. The main things to watch out for are:
when you solve for "x" in a weak base problem, you are solving for the HYDROXIDE concentration so be careful when the question asks you for the pH, not the pOH.
when you do the second ionization step in a polyprotic acid calculation, don't forget that your INITIAL concentrations will NOT be zero for the H+ and for the anion, HA-, that resulted from the first step!
Plenty of practice files are up now to help you practice for Friday's test.
Honors: we covered the best of nuclear in a day. I will tie up some loose ends tomorrow. I was impressed that you all seemed to be on top of what I was discussing with you. Cheers.
Regents: we revisited some mole-mole and mole-liter and mole-mass calculations and then went on to our next subtopic: Solutions. We will dig into more of those problems tomorrow.
# posted by C @ 6:49 PM 
