Dilutions and Colligative Properties
Journal
1. What is the molarity of a solution that has 3.5 moles of Sodium Hydroxide (NaOH) dissolved in 7 liters of water?
2. How many moles of sodium chloride (NaCl) are needed to make a 325 mL solution that is 5M.
3. Convert your answer for #2 into grams of NaCl
1. What is the molarity of a solution that has 3.5 moles of Sodium Hydroxide (NaOH) dissolved in 7 liters of water?
2. How many moles of sodium chloride (NaCl) are needed to make a 325 mL solution that is 5M.
3. Convert your answer for #2 into grams of NaCl
Dilutions and Colligative Properties
Formula for diluting a solution:
Sometimes in chemistry we need to dilute a very concentrated solution. In order to make sure we get the desired final concentration we use the following formula:
(M1)(V1) = (M2)(V2)
M1 = Starting concentration
V1 = Starting volume
M2 = Ending concentration
V2 = Ending Volume
Dilutions Practice Problems:
1. If you had a known solution of hydrochloric acid (12M) and needed to dilute it down to make 750ml of a 0.5M solution, how many mL of the 12M acid would you need?
2. If you have a beaker containing 350 mL of a 6M solution of NaOH and need to dilute it down to a 1.5 M solution, how much water should you add to the beaker?
Colligative Properties
Colligative Properites: Adding a solute to a liquid will RAISE the boiling point and LOWER the freezing point of that liquid
The amount of raising and lowering depends ONLY on the number of particles in the solution (not on the identity of the solute).
EXAMPLES:
Water with salt in it will boil at a higher temperature
Ice with salt on it will freeze at a lower temperature
Formula for diluting a solution:
Sometimes in chemistry we need to dilute a very concentrated solution. In order to make sure we get the desired final concentration we use the following formula:
(M1)(V1) = (M2)(V2)
M1 = Starting concentration
V1 = Starting volume
M2 = Ending concentration
V2 = Ending Volume
Dilutions Practice Problems:
1. If you had a known solution of hydrochloric acid (12M) and needed to dilute it down to make 750ml of a 0.5M solution, how many mL of the 12M acid would you need?
2. If you have a beaker containing 350 mL of a 6M solution of NaOH and need to dilute it down to a 1.5 M solution, how much water should you add to the beaker?
Colligative Properties
Colligative Properites: Adding a solute to a liquid will RAISE the boiling point and LOWER the freezing point of that liquid
The amount of raising and lowering depends ONLY on the number of particles in the solution (not on the identity of the solute).
EXAMPLES:
Water with salt in it will boil at a higher temperature
Ice with salt on it will freeze at a lower temperature