1. Unit 13: Solutions & Equilibrium
Concentration
Concentration
Molarity
Calculations
Print 5-10
mol L
M =

2. < = < A. Concentration 2 1 Concentrated Dilute 4 3 Concentration
relative amount of solute dissolved per given amount of solvent
solute
solvent
Dilute
Concentrated 1 2 3 4
< =
<

3. B. Molarity Molarity (M) moles of solute per liter of solution
Example:
3.0 M HCl molar HCl mol HCl
1 L

4. Preparing a Solution (in lab later)
B. Molarity
Preparing a Solution (in lab later) 1 2 3
Make a 0.5 M solution:
0) Add some of the solvent first (technically),,,
Add 0.5 mol solute to 1 L volumetric flask.
Swirl to dissolve.
Fill with DI (deionized) water exactly to the 1 L line.

5. C. Calculations Finding Molarity
What is the molarity of a solution containing 3.5 g NaCl in 100. mL of solution?
1 mol NaCl
g NaCl
3.5 g NaCl x =
0.060 mol NaCl
IV saline solution
0.060 mol NaCl L
0.60 M NaCl =
100. mL = L

6. C. Calculations Finding Molarity
What is the molarity of a solution with a volume of 2.00 L containing 36.0 g of C6H12O6 (glucose)?
1 mol C6H12O6
g C6H12O6
36.0 g C6H12O6 x =
0.200 mol C6H12O6
0.200 mol C6H12O L =
0.100 M C6H12O6

7. C. Calculations Finding Moles
How many moles of solute are in 3.80 L of M NaClO (bleach)?
0.700 mol NaClO
1 L
3.80 L x =
2.66 mol NaClO
0.700 M written as mol/L
bleach

8. C. Calculations Finding Moles
How many moles of solute are in 250. mL of M CaCl2?
0.250 L x mol CaCl2 =
1 L
0.550 mol CaCl2
250. mL = L

9. C. Calculations Finding Mass (g)
What mass of sodium hydroxide (NaOH) is needed to make 200. mL of a M solution?
0.200 L x mol NaOH =
1 L
mol NaOH x g NaOH =
1 mol
mol NaOH
1.20 g NaOH

10. C. Calculations Finding Volume (L)
How many liters of a 1.15 M solution are needed to give moles of solute?
0.805 mol x L =
1.15 mol
How many mL are needed?
0.700 L
0.700 L = 700. mL