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Making Solutions and Dilutions

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.

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Making Solutions and Dilutions

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  1. Making Solutions and Dilutions Unit 13 – PPT 2

  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.

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

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

  5. 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. • M1V1 = M2V2

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

  7. 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?

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