Thursday, March 08, 2007
Thurs-day 3
AP: we learned four ways to make a buffer solution and then we quantitatively calculated how to make a buffer of a particular pH. You must choose a weak acid with a pKa that is close to the desired pH of the buffer solution.
We looked at the general form of three of the four types of titration curves and the telltale signs of each type of curve.
We then began our first six-part titration, which is just the regular calculation of the pH of, in this case, a weak acid. We will be doing titrations all Monday and Tuesday. Over the 3-day weekend, practice all covered material.
Honors: we covered the remaining permutations of solubility curve problems using various quantities of water. We discussed soluble vs. insoluble salts; the charge density of the ions of the salt determines the degree of solubility of a salt. We stated that insoluble salts form dilute saturated solutions and soluble salts form concentrated saturated solutions.
We began the next subtopic of the math of chem marathon: The Gas Laws. Preview all of the assigned gas unit material and do some of the problems; this section is relatively easy because the formulas are not complex and its just plug and chug.
Regents: we had our stoichiometry , solutions, and solubility curve exam today. People need to attend extra help to work on their test-taking skills. Careless errors were made due to a lack of writing out the provided equations and simply plugging in the values and units from the question.
We looked at the general form of three of the four types of titration curves and the telltale signs of each type of curve.
We then began our first six-part titration, which is just the regular calculation of the pH of, in this case, a weak acid. We will be doing titrations all Monday and Tuesday. Over the 3-day weekend, practice all covered material.
Honors: we covered the remaining permutations of solubility curve problems using various quantities of water. We discussed soluble vs. insoluble salts; the charge density of the ions of the salt determines the degree of solubility of a salt. We stated that insoluble salts form dilute saturated solutions and soluble salts form concentrated saturated solutions.
We began the next subtopic of the math of chem marathon: The Gas Laws. Preview all of the assigned gas unit material and do some of the problems; this section is relatively easy because the formulas are not complex and its just plug and chug.
Regents: we had our stoichiometry , solutions, and solubility curve exam today. People need to attend extra help to work on their test-taking skills. Careless errors were made due to a lack of writing out the provided equations and simply plugging in the values and units from the question.
# posted by C @ 6:09 PM 
