Molarity & Dilutions. Molarity Concentration – Measure of the amount of solute that is dissolved in a given quantity of solvent Dilute solution – Contains.

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Presentation transcript:

Molarity & Dilutions

Molarity Concentration – Measure of the amount of solute that is dissolved in a given quantity of solvent Dilute solution – Contains a small amount of solute Concentrated solution – Contains a large amount of solute

Molarity

Example mol LM

LM

Learning Checkpoint A solution has a volume of 2.0 L and contains 36.0 g of glucose (C 6 H 12 O 6 ). What is the molarity of the solution? A solution has a volume of 250 mL and contains 0.70 mol NaCl. What is the molarity?

Making Dilutions Diluting a solution reduces the number of moles of solute per unit volume, but the total number of moles of solute in the solution does not change.

Example How many milliliters of aqueous 2.00 M MgSO 4 solution must be diluted with water to prepare mL of aqueous M MgSO 4 ?

Example How many milliliters of a solution of 4.00M KI are needed to prepare mL of 0.760M KI?

Concentration In Percent (V/V) Great if both are liquids

Example What is the percent by volume of ethanol (C 2 H 6 O)in the final solution when 85 mL of ethanol is diluted to a volume of 250 mL with water?

Learning Checkpoint If 10 mL of acetone is diluted with water to a total solution volume of 200 mL, what is the percent by volume of acetate in the solution?

Concentration in Percent (m/m) Great if solute is solid