Wednesday, March 07, 2007
Wednes -Day 2
Regents: TEST TOMORROW/THURSDAY, Day 3.
We covered each type of solubility curve problem with respect to saturated, unsaturated, and supersaturated solutions. Tomorrow's test will cover up to and including solubility curves.
Make sure that you are prepared for problems involving:
-balancing equations and the using that equation to determine relative moles of reactants and products
- mass to mole and mole to mass problems
-mole to mass, mole to volume of a gas at STP, mole to number of particles
-Molarity problems relating grams of solute, molar mass of solute, and volume of solution
- ppm, % by mass, and % by volume measures of concentration
- solution dilution problems
-colligative properties and the effect of salts vs. molecules on freezing pt. depression, boiling pt. elevation, and vapor pressure lowering.
- factors that affect the solubility of a given solute in a given solvent.
Good luck tomorrow. MAKE SURE that you come in prepared with your scientific calculator and several pens and pencils.
Honors: we discussed the factors that influence the degree of solubility of a given solute in a given solvent and also factors that influence the rate of dissolving. We then looked at solubility curves and did the various calculations involving the formation of saturated, unsaturated, and supersaturated solutions. We also calculated the extent of precipitation when a saturated solution is cooled.
Be careful about scaling up or down when you have a solution that does NOT contain 100. g of water. The way to avoid errors, in this case, is to draw out the solutions and label the relative amounts of solute in the saturated solutions containing 100.g of water and the other amount of water.
We will do some more of these problems and go onto our next topic: the gas laws, which you will complete over the 3-day weekend.
AP: we covered one of the types of buffers and showed how acidic buffer solutions can react with added strong acid or base to minimize change in pH. We then did a quantitative problem using the all-important SRFC table, which is like an ICE table but it accounts for the changing volume of the solution and it really shows you what happens to a limiting reactant reaction i.e. usually the added acid or base is limiting and completely reacted to form the products; this process alters the ratio of the acid to its conjugate base in the buffer solution, which will change the pH slightly. More examples and a chart of the FOUR ways to make a buffer solution, tomorrow.
We covered each type of solubility curve problem with respect to saturated, unsaturated, and supersaturated solutions. Tomorrow's test will cover up to and including solubility curves.
Make sure that you are prepared for problems involving:
-balancing equations and the using that equation to determine relative moles of reactants and products
- mass to mole and mole to mass problems
-mole to mass, mole to volume of a gas at STP, mole to number of particles
-Molarity problems relating grams of solute, molar mass of solute, and volume of solution
- ppm, % by mass, and % by volume measures of concentration
- solution dilution problems
-colligative properties and the effect of salts vs. molecules on freezing pt. depression, boiling pt. elevation, and vapor pressure lowering.
- factors that affect the solubility of a given solute in a given solvent.
Good luck tomorrow. MAKE SURE that you come in prepared with your scientific calculator and several pens and pencils.
Honors: we discussed the factors that influence the degree of solubility of a given solute in a given solvent and also factors that influence the rate of dissolving. We then looked at solubility curves and did the various calculations involving the formation of saturated, unsaturated, and supersaturated solutions. We also calculated the extent of precipitation when a saturated solution is cooled.
Be careful about scaling up or down when you have a solution that does NOT contain 100. g of water. The way to avoid errors, in this case, is to draw out the solutions and label the relative amounts of solute in the saturated solutions containing 100.g of water and the other amount of water.
We will do some more of these problems and go onto our next topic: the gas laws, which you will complete over the 3-day weekend.
AP: we covered one of the types of buffers and showed how acidic buffer solutions can react with added strong acid or base to minimize change in pH. We then did a quantitative problem using the all-important SRFC table, which is like an ICE table but it accounts for the changing volume of the solution and it really shows you what happens to a limiting reactant reaction i.e. usually the added acid or base is limiting and completely reacted to form the products; this process alters the ratio of the acid to its conjugate base in the buffer solution, which will change the pH slightly. More examples and a chart of the FOUR ways to make a buffer solution, tomorrow.
# posted by C @ 5:11 PM 
