1. Return from Winter Break: Periodic Trends and Gases Quiz
Guided Inquiry: Molarity

2. Warm Up
SEE HAND OUT: About Winter Break Assignment SHOW ME : Cornell Notes for Chapters 7 and 10 TIME: 3 MINUTES WHEN DONE: Be ready to review questions from handout and turn in Guided Inquiry: Oxidation Numbers

3. Agenda Review Questions and Answers Mini-Quiz (only Multiple Choice)
Molarity and Dilution
Demonstration: Hot Ice
Guided Inquiry: Molarity
Homework: Lab Notebook Set Up - Conductimetric Titration and Gravimetric Determination of Precipitate

4. REVIEW THE FOLLOWING 7.1 pg 264 A-46 7.3 pg. 265 7.5 pg. 269 7.7
SECTION
PRACTICE PROBLEM 2 WITH PG. NUMBER
ANSWER KEY
7.1
pg 264
A-46
7.3
pg. 265
7.5
pg. 269
7.7
pg. 271
7.8
pg. 276
10.3
pg. 408
A-47
10.4
pgs

5. Winter Break Quiz: Multiple Choice
SPREAD OUT: One person per table WRITE: Name and Date on Answer Sheet (make sure to write capital letter) USE: Scratch Paper WHEN INSTRUCTED: Turn Over Quiz and Begin TIME: 35 MINUTES WHEN DONE: Reread your answers and make sure they are correct

6. MOLARITY and DILUTION

7. volume of solution in liters
Molarity
The quantity of solute in a solution can matter to a chemist.
We call the amount dissolved its concentration.
Molarity is one way to measure the concentration of a solution:
moles of solute
volume of solution in liters
Molarity (M) =

8. Mixing a Solution
To create a solution of a known molarity, weigh out a known mass (and, therefore, number of moles) of the solute.
Then add solute to a volumetric flask, and add solvent to the line on the neck of the flask.

9. Molarity Check
Which is more concentrated, a solution prepared by dissolving 21.0 grams of NaF in enough water to make 500 mL of solution, or a solution prepared dissolving 10.5 g of NaF in enough water to make 100 mL of solution? (Molar mass of NaF= 42.0 g/mol)
0.500 mol / L = 1 M
0.250 mol / 0.1L = 2.5 M
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10. Molarity Check
What is the molar concentration of K+ ions in a M solution of potassium carbonate?
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11. Molarity Check
What is the concentration of ammonia in a solution made by dissolving 3.75 grams of ammonia in L of water? How many grams of Na2SO4are there in 15 mL of 0.50 M Na2SO4? How many mL of 0.50 M Na2SO4 solution are needed to provide mol of this salt?
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12. Dilution One can also dilute a more concentrated solution by
using a pipet to deliver a volume of the solution to a new volumetric flask, and
adding solvent to the line on the neck of the new flask.

13. Dilution
The molarity of the new solution can be determined from the equation
M1  V1 = M2  V2,
where M1 and M2 are the molarity of the concentrated and dilute solutions, respectively, and V1 and V2 are the volumes of the two solutions.

14. Dilution: Check 1.75 mL 8.75 mL 48.6 mL 57.1 mL 28570 mL
What volume of a 1.00 M stock solution of glucose must be used to make 500 mL of a 1.75 x 10-2 M glucose solution?
1.75 mL
8.75 mL
48.6 mL
57.1 mL
28570 mL

15. Using Molarities in Stoichiometric Calculations

16. Titration
A titration is an analytical technique in which one can calculate the concentration of a solute in a solution.

17. Titration
A solution of known concentration, called a standard solution, is used to determine the unknown concentration of another solution.
The reaction is complete at the equivalence point.

18. Demonstration: Hot Ice
170 g of sodium acetate 30 mL of water What is the molarity?

19. Guided Inquiry: Molarity
COMPLETE: Molarity Guided Inquiry WORK: Together USE: Notes and each other TIME: 15 MINUTES WHEN DONE: Turn into class box and begin reading pre-lab