Solubility & Concentration

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Presentation transcript:

Solubility & Concentration

Concentration of Solution Solvent Solute

Molarity Example Problem 1 NaCl 12.6 g of NaCl are dissolved in water making 344mL of solution. Calculate the molar concentration.

% Concentration Mass percent: % (w/w) = Volume percent: % (v/v) =

% Concentration Example Problem What is the concentration in %v/v of a solution containing 3.2 L of ethanol in 6.5 L of solution? % (v/v) =

Parts per million (ppm) or = ppm Mass and volume units must match. (g & mL) or (Kg & L)

ppm Example Problem 1 An Olympic sized swimming pool contains 2,500,000 L of water. If 1 tsp of salt (NaCl) is dissolved in the pool, what is the concentration in ppm? 1 teaspoon = 6.75 g NaCl or

Molality Molality (molal volume): moles solute for each kilogram of solvent m = mol/kg Uses only mass not volume. Volume for some liquids is temperature dependant

antifreeze is ethylene glycol C2H6O2 Molal (m) Example Problem 1 If the cooling system in your car has a capacity of 14 qts, and you want the coolant to be protected from freezing down to -25°F, the label says to combine 6 quarts of antifreeze with 8 quarts of water. What is the molal concentration of the antifreeze in the mixture? antifreeze is ethylene glycol C2H6O2 1 qt antifreeze = 1053 grams 1 qt water = 946 grams m = = 13 m