Molarity (M) = moles
V
(in liters)
1.0 Liters = 1000 mls
Worksheet #1
Find the concentration in moles/liter (Molarity) for each of the following mixtures.
1. 4.0 moles of NaCl are dissolved in 3.0 Liters
2. 5.0 moles of BaF
2
are dissolved in 10 Liters
3 6.0 Moles are dissolved in 200 milliliters
4. 0.8 moles are dissolved in 500 milliliters
5. 88 grams of CO
2
gas are dissolved in 4.o Liters of water
6. 1.8 x 10 23 mlc of Iron chloride are dissolved in 1.5 Liters of water.
The equation for concenetration can be rearranged as
M X V(in liters) = moles .
M x V (in mls) = millimoles
Solve the following questions
7. How many moles of silver chloride (AgCl) are in 2.0 liters of a 3.0 Molar soln? How many grams of silver chloride is this?
8. How many moles of potassium cyanide (KCN) are in a 0.50 liter soln with a concentration of 5.0 Molar? How many grams is this?
9. How many moles are in a 800 ml sample of a 2.0 Molar soln of NaOH? How many grams is this?
10. How many liters of a 4.0 Molar soln will give us exactly 6.0 moles of solute?
11. How many liters of a 0.50 Molar soln will give you exactly 1.5 Moles of solute?
12. A reaction calls for 2.5 moles of silver nitrate. All you have on hand is a 3.0 Molar silver nitrate soln. What volume of the soln will you need to use in order to get exactly
2.5 moles of reactant?
SHOW ALL WORK ON A SEPARATE SHEET OF PAPER!!!!!!!

Worksheet #2
Dilutions involve adding more solvent, while the solute remains unchanged. The number of moles solute before and after the dilution will always be the same. moles solute before = moles solute after
M1x V1= M 2x V2
Solve the following problems
13. 6 liters of a 2.0 Molar soln is diluted with 4 liters of water.
14. 2 liters of a 6.0 Molar soln is diluted with 4 liters of water.
15. 500 mls of a 8.0 Molar soln is diluted with 100 mls of water
16. You start with a 12 Molar soln of HCl. You only need 600 mls of a 3.0 Molar soln.
How much of the 12 Molar soln should you use to make the dilution? How much
WATER must you add to it?
17. A chemistry teacher needs an soln that is 6 Molar. She needs a total of 3.0 of this new soln. All she has on hand is an 8 Molar soln of acid. How much of the concentrated soln will she need to use? How much water must she add in order to dilute it to the correct concentration?
18. A experiment calls for 2 liters of a 1.5 Molar soln of NaOH. The stock room has a
10.0 Molar soln of NaOH. How much of the concentrated soln must be used to create the diluted soln? How much water will be added to it?

Combining solns
19. 100 mls of a 6.0 Molar soln of LiCl is added to 200 mls of a 3.0 Molar soln of LiCl, what is the new concentration of this soln?
20. 4 liters of a 0.5 Molar soln of KI is added to 3 liters of a 3.0 Molar soln of KI. What the new concentration of this KI soln when these solns are mixed?
21. 0.500 liters of a 6.0 Molar soln of NaHCO3 is added to 2.5 liters of a 2.0 Molar soln of NaHCO
3
. What is the concentration of the mixed solns?