1. Precipitate
1. A precipitate is known as a a. solid b. liquid c. gas 2. Out of the 5 reactions we talked about, which ones deals with the formation of a precipitate? a. combustion b. single c. double 3. If you have a double replacement reaction and you know both reactants, can you predict the products? a. yes b. no 4. What do you have to check to see if a precipitate will form? a. activity series b. solubility rules

2. Terms - Review
AQUEOUS - solid dissolved in water SOLUBLE – the substance that will dissolve in another substance
Example: salt + water
INSOLUBLE – the substance that will NOT dissolve in another substance
Example: sand + water

3. SOLUTE – the substance being dissolved
Terms
SOLUTE – the substance being dissolved
SOLVENT – the substance that dissolves the solute
SOLUTION – a mixture of substances
 Homogenous (looks the same)

4. Molarity
Last part of Mole Island
Molarity = moles of solute
liters of solution
M = moles L
***liters here is different than the 22.4 liters of STP
***to covert mL to L, divide mL by 1000

5. Molarity
mol L M

6. Examples
What is the volume of solution when 2.30 moles of potassium chromate are dissolved to produce a molarity of 0.89 M?
2.30 mols / 0.89 M = 2.6 L

7. Examples
Find the molarity for 734 g of lithium sulfate when dissolved to make 2500 mL of solution.
2500 mL / 1000 mL = 2.5 L
734 g x ( 1 mol Li2SO4 / g Li2SO4)
= 6.68 mols
M = mols / L = 6.68 mols / 2.5 L = 2.7 M