Current Unit: Solubility Products and Solution Equilibria
Homework Schedule I eliminated the assignment for March 23rd in an attempt to shorten the unit
Look for daily solutions for homework here.
Daily Homework Solutions March 16th
Thursday, March 19th Homework Solutions
Time to try Quiz 17 on Ksp Answers found below
You aren't peeking, are you?
Solutions: question 1 (a) PbCl2 it has the biggest value for Ksp. The fact that it is a 3rd order Ksp would actually increase the amount that dissolves. question 2 Ksp = [Ca2+][OH-]**2 one point (two stars is old computer code for power) [OH-] = 2x.022M = .044M another point Ksp = 4.3 x 10**-5 point
four points total
Friday, March 20th The Vernal Equinox homework solutions
Quiz 18...More Ksp solutions below
2 points question 1 (c) only PbSO4 will ppt. plug in the given molarities for both Ksp formulae. You see that the Q value for Ag2SO4 is less than Ksp, but for PbSP4 is more than Ksp. Only PbSO4 will precipitate question 2 addition of HCl increases solubility HCl absorbs (neutralizes) OH- ions, causing a right shift, increasing dissolved Ca(OH)2
That's all for chapter 16. Chapter 17 is next.
If you can fire off an e-mail to let me know how you did on the quizzes, and what you had problems with, I would appreciate it.
Monday, March 23rd
Chapter 17 Free Energy and Entropy
Follow the timeline I have here, not on the take-home.
You remember entropy from regents...right? Nature loves disorder. This year we will quantify randomness...that's right! Randomness has a unit!
We will use Gibb's Free Energy Equation to exploit the relationship between Randomness, Heat, and Free Energy (another way to express thermodynamic favorability).
Note Packet for chapter 17. I included this and a filled-in version in your take-home stuff. Review and understand notes up to and including Gibb's Free Energy Equation
Homework due Tuesday
Important Concept: Positive Entropy Change (more disorder) is favored at high temperature (like evaporation) Negative Entropy Change (less disorder) is favored at lower temperatures (like freezing)
Change in plans The AP will not be testing on chapters 17 or 18 See your e-mail for details on review assignments