1. Molarity
ICS III
Week 7

2. Kool Aid
Ingredients in Kool Aid
Water
Sugar

3. Kool Aid Kool Aid is a solution
Mixture of solutes dissolved in solvents
Solute
Dissolved particles in a solution
sugar
Solvent
The dissolving medium of a solution
water

4. Grams per Liter
represent the mass of solute divided by the volume of solution
50g sugar/ 100 g water
The ratio would be 1:2
1 part sugar to 2 parts water

5. Molarity moles of solute divided by liters of solution.
Calculate the number of moles of dissolved solute and divide by the volume in liters of the total solution, yielding units of moles per liter.

6. Grams per liter Moles per liter Grams of solute Liters of solvent
moles of solute
Liters of solvent
g/L M
Grams per liter
Molarity
180 g C6H12O6
1 L H2O
1 mol C6H12O6
1 L H2O
= 180 g/L
= 1M solution
180 g C6H12O6
= 1 mol C6H12O6

7. Molarity of Pepsi Cola 12 fl oz = 355 ml = .335 L What is the g/L??
41g/.335 L = 122 g/L
What is the Molarity
1 mole = 180 g sugar
41 g = .23 mol sugar
.23 mol sugar
.335 L Water
= .69 M

8. How many moles of HNO3 are needed to prepare 5. 0 liters of a 2
How many moles of HNO3 are needed to prepare 5.0 liters of a 2.0 M solution of HNO3?
2.5 5 10 15
5.0 liters
2.0 M
X moles =

9. Parts Per Million (ppm)
a ratio of one part of solute to one million parts of solvent, is usually applied to very dilute solutions.
Chorine in a pool
7.2 – 7.4 ppm
To calculate parts per million
determine the mass of solvent and solute
divide the mass of the solute by the total mass of the solution.
Multiply by 106 (1 million) and expressed as parts per million (ppm).

10. Practice Problem/ ppm
The Dead Sea is the saltiest sea in the world. It contains 332 grams of salt per 1000 grams of water. What is the concentration in parts per million (ppm)?
.332 ppm
332 ppm
33,200 ppm
332,000 ppm
332 g
1000 g
Grams solute
Grams solvent =
332,000
X 106

11. Percent Composition
The ratio of one part of solvent to one hundred parts of solvent and is expressed as a percent.
To calculate percent composition
determine the mass of solvent and solute
divide the mass of the solute by the total mass of the solution.
Multiply by 100 and expressed as a percent.

12. Percent Composition
The Dead Sea is the saltiest sea in the world. It contains 332 grams of salt per 1000 grams of water. What is the percent composition?
.0332%
.332%
33.2%
332%
332 g
1000 g
Grams solute
Grams solvent =
33 2
X 100

13. Combine Both Concepts
What is the concentration of a 4% solution converted to parts per million (ppm)
4,000 ppm
40,000 ppm
400,000 ppm
4,000,000 ppm
Step 1: Convert from percent to concentration
4%/100
.04
.04 x 106 (1,000,000)