1. Chemistry 202 Dr. Don DeCoste 3014 Chemistry Annex
11am-12pm Mondays and Wednesdays (after lecture)
10-11 am Tuesdays and 1-2 pm Thursdays
By appointment; open door policy

2. Chemistry Learning Center
2021 Chemistry Annex
Chemistry TAs available from 9 am – 5pm Mondays – Fridays. Link to the schedule is on the website (Contact Information)
Chemistry 202 TAs in the CLC:
Mondays: 11am – 1 pm
Wednesdays: 3 – 5 pm
Thursdays: 1 – 3 pm

3. Lon-Capa 1st HW assignment due tonight by 10 pm.
1st “Quiz” (2nd HW) due Sunday, 9/10 by 10 pm. It will open today at 5 pm.

4. For Today Textbook Homework Videos Chapter 4: Solution Stoichiometry
Precipitation Stoichiometry I: Net Ionic Equations
Precipitation Stoichiometry II: Complete Equations
Challenge Problem: Chapter 4 #121

5. For Monday
Textbook Homework
Chapter 5: 8, 15, 16, 26, 28, 29, 31, 119

6. James Scholar Opportunity
REACT: is an outreach program that goes to elementary schools to teach students chemistry.
September 11th, 12th, or the 13th at 6pm.
11th: 1027 Lincoln Hall
12th: 114 Transportation Building
13th: 319 Greg Hall
Questions? Send an to the REACT student president Samuel Cler at

7. Concentration of Vinegar?
Knowing that vinegar is an aqueous solution that is 5.00% acetic acid [HC2H3O2(aq)] by mass and has a density of 1.01 g/mL, determine the concentration of vinegar in molarity.

8. NaHCO3(s) + HC2H3O2(aq) → NaC2H3O2 (aq) + H2O(l) + CO2(g)
How Much Vinegar?
NaHCO3(s) + HC2H3O2(aq) → NaC2H3O2 (aq) + H2O(l) + CO2(g)
We have 10.5 g of baking soda. Knowing that vinegar is 0.841M acetic acid, determine the minimum volume of vinegar required for a complete reaction. [~149 mL]

9. Solubility Rules

10. Clicker Question
A 15.0 g sample consisting of a mixture of silver nitrate and sodium nitrate is dissolved in water. This aqueous mixture then reacts with an excess of aqueous potassium chloride to form 3.97 g of solid. Calculate the percent by mass of silver nitrate in the first mixture.
a) 22.3% d) 72.9%
b) 31.4% e) I cannot do this problem.
c) 47.1%

12. Challenge Problem – Ch. 4

13. Clicker Question
Consider mixing mL of 0.125M solution of calcium nitrate with mL of a 0.125M solution of sodium phosphate to produce a solid. Determine the mass of solid formed.
a) g
b) g
c) g
d) g
e) g

14. Clicker Question
Consider mixing mL of 0.125M solution of calcium nitrate with mL of a 0.125M solution of sodium phosphate to produce a solid. Determine the concentration of the phosphate ion after the precipitation reaction is complete.   
a) M d) M
b) M e) 0 M
c) M

15. Challenge Problem – Ch. 4