1. To Do Finish reading Chapter 4. Text homework for Chapter 4.
Quiz #2 on Friday, February 12
Lon-Capa assignment #3.

2. Exam Tuesday, 2/16, 7:00-8:30 pm; rooms online.
Conflict exam; 2/16, 5:00-6:30 pm; in 153 Mechanical Eng. Bldg. Sign up in 367 Noyes Lab
Review sessions
Saturday (2/13): 3:30-5:00 pm Chem. Lib.
Sunday ( 2/14 ): 1:00-2:00 pm in 217 NL

3. Practice Problem (last time)
Describe how to make mL of 0.100M NaOH from a stock solution of 8.00M NaOH.

4. Clicker Question
You mix a 3.00 M sugar solution with a 5.00 M sugar solution. Which of the following best describes the concentration of the new solution?
a) Less than 3.00 M.
b) Between 3.00 M and 5.00 M.
c) 8.00 M.
d) Greater than 8.00 M.
e) The answer could be more than one of the above choices depending on the volumes of the original solutions.

5. A Question For You…
You mix mL of a 3.00 M sugar solution with mL of a 5.00 M sugar solution.
Determine the concentration (in molarity) of the resulting sugar solution.

6. Problem Solving Approach
What are we trying to solve? That is “where are we going?”
What does this mean?
What do we know? That is, “where have we been?”
What procedures do we know? That is, “how do we get there?”
Requires knowledge and understanding!

7. Chapter 4: #60
What mass of silver chloride can be prepared by the reaction of mL of 0.20M silver nitrate with mL of 0.15M calcium chloride?
Also, calculate the concentrations of each ion remaining in solution after precipitation is complete.

8. A Question for You…
Consider a 1.50 g mixture of sodium nitrate and sodium chloride. The mixture is dissolved in 100 mL of water to which is added an excess of 0.500M silver nitrate. A white solid is collected, dried, and found to have a mass of 3.14 g.
Calculate the percent sodium chloride by mass in the original unknown mixture.