Concentration- Nov. 30

In Tuesday's class we learned about concentration and its units.

Vocabulary:
Solution- A homogeneous mixture
Solute- The one present in smaller amount
Solvent- The one present in greater amount
Concentration- Amount of solute/Amount of solvent

Some units for Concentration:
g/mL, g/L, mg/L, mg/mL, ug/L

The most common (and useful) units are:
mol/L = Molarity = Concentration

Examples:
Stefano dissolves 108g of NaBr in enough water to make 300mL of the solution. What is the concentration?
Con'c = 108g/300 mL = 0.36g/mol [NaBr] = ? 0.300L = V

108g x 1 mol/108g M = 1.0mol/0.300L = 3.33mol/ L = 3.33M

Jayson wants to make 600.0mL of 0.60M CaCl2. What mass of solid CaCl2 is required?
V = 0.600L con'c ---> mol ---> mass
mol = M x L = 0.6m/L x 600L = 0.36mol x 111.1g/1mol = 39.996 or 40g