1. To Do… Electronic homework Exam 2: Thursday, March 15 OWL:
Chapter 9 (Part 2): Wednesday, March 7
Chapter 13 (Gas Stoichiometry): Friday, March 9
Chapter 15 (Solution Stoichiometry): Tuesday, March 13
Lon-Capa: Exam 2 review: due Wednesday, March 14 by 10 pm
Exam 2: Thursday, March 15

2. To Do… Lectures Lab tomorrow Discussion Section
Chapter 9 and Sections and 15.6 & 15.7.
Lab tomorrow
Pre-lab is due before lab.
Discussion Section
Turn in text homework.
Turn in lab write-up.

3. Starting With Masses
You react 84 g of N2(g) with 22 g H2(g) to produce ammonia [NH3(g)].
Determine the mass of ammonia produced.
Determine the mass of left-over reactant.

4. Clicker Question
When lead(II) nitrate and potassium iodide are mixed, what precipitate will form?
A) KNO3
B) PbI
C) K(NO3)2
D) PbI2
E) No precipitate will form.
Solubility Rules
Most nitrate salts are soluble.
Most salts of sodium, potassium, and ammonium cations are soluble.
Most chloride and iodide salts are soluble. Exceptions: Ag+ and Pb2+.
Most sulfate salts are soluble. Exceptions: Ca2+, Ba2+, and Pb2+.
Most hydroxide salts are only slightly soluble. Soluble ones are: Na+, K+, and Ca2+.
Most sulfide, carbonate, and phosphate salts are only slightly soluble.

5. Stoichiometry Problem
Suppose we mix mL of 0.100M Pb(NO3)2 (aq) with 0.200M KI (aq).
What volume of KI solution do you need to completely react with Pb(NO3)2?
What is the mass of solid produced?

6. Stoichiometry Problem
Consider mL of 0.30M Pb(NO3)2 (aq) mixed with mL of 0.40M KI (aq).
What ions are left in solution after the reaction is complete?
What is the mass of solid produced?
What are the concentrations of the
ions left in solution after the reaction is
complete?

7. Stoichiometry Problem
Consider mL of 0.30M Pb(NO3)2 (aq) mixed with mL of 0.40M KI (aq).
Determine the number of moles of all ions in the solution initially.
Determine which reactant is limiting.

8. Clicker Question
What ions are left in solution after the reaction is complete?
I. Pb2+
II. NO3–
III. K+
IV. I–
A) II and III
B) I and IV
C) I, II, and III
D) I, II, III and IV
E) No ions are left in solution after the reaction is complete.

9. Stoichiometry Problem
Consider mL of 0.30M Pb(NO3)2 (aq) mixed with mL of 0.40M KI (aq).
Determine the mass of solid formed from a complete reaction.
Determine the concentrations of all ions after the reaction is complete.