Making Solutions and Dilutions Unit 13 – PPT 2. Molarity  M = moles solute/liters of solution  Uses the symbol M  Example:  2 moles of glucose are.

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Presentation transcript:

Making Solutions and Dilutions Unit 13 – PPT 2

Molarity  M = moles solute/liters of solution  Uses the symbol M  Example:  2 moles of glucose are dissolved to make 2 liters of solution.  M = 2 moles/2L = 1M  That means there is 1 mole of glucose per 1 liter of solution.

Page 23, Problem #1  Determine the grams of solute needed to make 1.00L of a 1.0M solution of NaCl.

Page 23, Problem 2  Determine the grams of solute needed to make 1.00L of a 0.50M solution of sodium nitrate.

Dilutions  Use a concentrated stock (standard) solution to make a more dilute solution.  Start with a small amount of the standard solution and add water to lower the concentration.  Since moles of solute are constant, can set up a proportion.  M 1 V 1 = M 2 V 2

Page 27, Problem #2  What volume of 0.250M KCl is needed to make 100.0mL of 0.100M KCl solution?

Page 27, Problem #3  Concentrated sulfuric acid is 18.0M. What volume of this standard solution is needed to make 2.00L of 1.00M sulfuric acid?