SI Chem 178
Chapter: 15 (Le Chatelier’s,) and 16
Leader: Emily
Feb 7th, 2013
Let’s Not Forget…
Ch 13: See pg 529 for conversion of molality and molarity… (Separate sheet of paper!)
Ch 13: Is the solubility of a gas in a closed chamber affected by pressure? What about
solids and liquids?
Ch 13: As temperature increases, solubility generally: increases/decreases Which type
of solution can we make using this property? Is that solution stable?
Colligative Properties depend upon: species dissolved/concentration of species
Definition of: Arrhenius Acid/Base?
Definition of: Bronsted-Lowry Acid/Base?
What’s another word for “basic”?
Any questions from Ch 15? … (Kc/Kp – equations, values/magnitude, Q,
heterogeneity/homogeneity, ICE, Le Chatelier’s)
For the Quizzy…
Le Chatelier’s (See book pages: 630-639, awesome diagram on pg 631)
Kc is affected by… ?
What information is helpful in determining which way a reaction will go with
temperature change? Think H values…
**REMEMBER YOUR STRONG ACIDS AND BASES!**
Conjugate Acid and Base Pairs: List the conjugate species of the following chemicals.
Note whether they are an acid or base. What is unique about the starred (*) examples?
NH3
H3PO4
HCl
Li(OH)2
NaOH
*HCO3H2SO4
*HSO4What is the value of Kw? ___________________
What is the equation that relates pH and pOH? _____________________________
What does that “p” from above mean? _______________________
When can we use Kw as our Kc for an equilibrium acid/base reaction?
A solution is acidic/basic when its [H+] > 1x10^-7M
A solution is acidic/basic when its [H+] < 1x10^-7M
A solution is Acidic/basic when its [OH-] > 1x10^-7M
A solution is acidic/basic when its [OH-] < 1x10^-7M
I dissolved 4.3x10^-6 moles of HI in 1.25L of water. What is my proton concentration,
hydroxide ion concentration, pH, and pOH? (What information must you interpret here!?)
How would you go from pOH to H+ concentration? Example: I have 0.08M OH- in
solution, what is my H+ concentration (hint, use equation mentioned above…)?
Weak Acid Calculations: Ka and % Ionization
What is the GENERAL equation for Ka? What do all the components mean? Write it out
for HCl (please).
What are the Ka and equilibrium concentrations of components in a solution of HF at a
pH of 2.96?
What is the above acid’s % dissociation? (Write out the basic equation, then apply it!)
ON A SEPARATE SHEET: I have 0.4M HNO2 (Ka=4.5x10^-4 @ 25 Deg C)… What is
my pH?