Wednesday, March 21, 2012
Wednes-Day 1
AP Chem - we finished the second permutation of a titration of a weak acid by a strong base; we looked at the common points of interest, this time determining the pKa of the acid from the titration "halfway to the equivalence point" data.
We then saw the same types of calculations for a titration of a weak base (pyridine) by a strong acid.
We then discussed acid-base indicators, which themselves are weak acids, thus just a few drops are used so that these weak acids do not significantly affect the pH of the solutions that they are indicating.
We saw how to determine an appropriate indicator for a given equivalence point pH; the indicator must have a pKa within one unit of the equivalence point pH so that the indicator will be in its buffer range thus showing an intermediate color of its acid and anion forms.
Bio - we went through each of the phases of meiosis, showing the important events in each phase.
You should practice drawing these from scratch, so that you can see when the cells become haploid from diploid, and when the three causes of genetic variety occur.
We then saw the same types of calculations for a titration of a weak base (pyridine) by a strong acid.
We then discussed acid-base indicators, which themselves are weak acids, thus just a few drops are used so that these weak acids do not significantly affect the pH of the solutions that they are indicating.
We saw how to determine an appropriate indicator for a given equivalence point pH; the indicator must have a pKa within one unit of the equivalence point pH so that the indicator will be in its buffer range thus showing an intermediate color of its acid and anion forms.
Bio - we went through each of the phases of meiosis, showing the important events in each phase.
You should practice drawing these from scratch, so that you can see when the cells become haploid from diploid, and when the three causes of genetic variety occur.
# posted by C @ 8:00 PM 
