1. Molarity (M) M = moles of solute / Liters of Solution
What is the molarity of a solution where 25 grams of NaCl is dissolved in 250 mL of water?

2. Dilutions
Most chemicals come from the chemical company in the most concentrated form.
For example, when we order hydrochloric acid it comes in a big stock bottle with a concentration of 15 M.
Most of the labs that we do only require 1.0M HCl.
How do we make a 1.0M solution?

3. Dilution Problems
A stock solution of 1.00M NaCl is available. How many milliliters are needed to make mL of 0.750M NaCl?
M1V1 = M2V2

4. Tro's Introductory Chemistry, Chapter 13
Practice—How Many Grams of CuSO45 H2O (MM ) are in mL of a 1.00 M Solution?
Tro's Introductory Chemistry, Chapter 13

5. Tro's Introductory Chemistry, Chapter 13
Practice—How Would You Prepare mL of M K2SO4 (MM = )?
Tro's Introductory Chemistry, Chapter 13

6. Molality (m) m = moles solute / kilograms solvent
What is the molality of a solution where 45 grams of NaCl is dissolved in 333 grams of solvent?

7. Tro's Introductory Chemistry, Chapter 13
How Many Liters of M KI Is Needed to React with L of a M Pb(NO3)2? 2 KI(aq) + Pb(NO3)2(aq) 2 KNO3(aq) + PbI2(s)
Tro's Introductory Chemistry, Chapter 13

8. Tro's Introductory Chemistry, Chapter 13
How Many Liters of M Ba(OH)2(aq) Are Needed to React with L of M HCl? Ba(OH)2(aq) + 2 HCl(aq)  BaCl2(aq) + 2 H2O(l)
Tro's Introductory Chemistry, Chapter 13

9. How many grams of iodine will react with 200 mL of a 2M solution of Na2S2O3?
Na2S2O I2  NaI Na2S4O6