POINT > Define molarity and solve associated problems POINT > Define molality and solve associated problems.

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Presentation transcript:

POINT > Define molarity and solve associated problems POINT > Define molality and solve associated problems

mol of solute L of solution Molarity (M) = POINT > Define Molarity and solve associated problems Because volume is temperature dependent, molarity of a solution can change with temperature.

WB CHECK What is the molarity of 614ml of an aqueous solution containing 16.4g calcium chloride? ~.241M CaCl 2

WB CHECK What mass of sodium fluoride is required to make 375ml of a 0.015M solution? ~ 0.24g NaF

WB CHECK: You make a solution by adding water to 35.0 mL of methanol (CH 3 OH) until the final volume of the solution is 275 ml. What is the molarity? (The density of methanol is g/mL) ~ 3.15M methanol solution

mol of solute kg of solvent Molality (m) = POINT > Define Molality and solve associated problems Because moles and mass do not change with temperature, molality (unlike molarity) is not temperature dependent.

WB CHECK: You make a solution by adding 83 grams of sodium hydroxide to 750 mL of water. What is the molality of sodium hydroxide in this solution? ~ 2.8m

WB CHECK: In order to make a 0.60 m solution, what mass of potassium phosphate is needed to add to mL of water? ~ 51g K 3 PO 4

Homework: Read 12.3 and complete all practice problems Complete Section 3 F.A #1-4