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Solution Concentrations. Different ways of representing how much stuff is contained in a solution. Solution Components . Solution: a homogeneous mixture of two or more substances in a single phase

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Solution concentrations l.jpg

Solution Concentrations

Different ways of representing how much stuff is contained in a solution


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Solution Components

  • Solution: a homogeneous mixture of two or more substances in a single phase

    • Atoms, molecules, or ions are thoroughly mixed so that the substance has a consistent composition and properties

  • Solute: The substance being dissolved

    • USUALLY the smaller amount

    • The particles of solute are so small that they can not be seen

  • Solvent: The substance doing the dissolving


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Some Commonly Used Ways of Representing Concentration

  • Molality

    • Moles of solute per kilogram of solvent

  • Percent by Volume

  • Percent by Mass

  • Parts per Million

  • Parts per Billion

  • Parts per Trillion


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Molarity

  • Number of moles of solute per liter of solution


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Perform the following calculations…

  • What is the molarity of a solution prepared by dissolving 37.94 g of potassium hydroxide to produce a 500.0 mL solution?

  • What is the molarity of a 3500.0 mL solution that contains 141.6 g of citric acid (C3H5O(COOH)3)?

  • How much sodium hydroxide would be needed to produce 750.0 mL of a 6.00 M solution?

  • How many grams of K2Cr2O7 are needed to make 250.0 mL of a 0.125M solution?


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Preparing Solutions by Dilution

  • In many cases, solutions are sold in high concentrations and diluted with distilled water (or other solvents) to produce a solution with a desired concentration

    • Any ideas why?

  • When this is the case, the number of moles is the quantity that will determine the volumes needed…


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Perform the following calculation

  • Calculate the amount of a 12.0 M hydrochloric acid solution (HCl) that is needed to produce 500.0 mL of a 2.00 M HCl solution.

  • Determine the moles of solute required for the desired solution

  • Use the SAME NUMBER OF MOLES to calculate the volume of the concentrated solution that would provide this amount

  • Make up the volume difference with distilled water (or other specified solvent, if you are actually making the solution)


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Perform the following calculations…

  • What volume of a 6.77 M nitric acid (HNO3) solution to produce a 250.0 mL of a 1.50 M solution?

  • What is the molarity of a solution that is made by diluting 50.00 ml of a 4.74 M HCl solution to 250.0 mL?

  • How much final solution would be made by adding water to 1.19 mL of a 8.00 M acetic acid solution (CH3COOH) to produce a final molarity of 1.50 M?


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Perform the following calculations…

  • What is the final molarity of an ammonium chloride solution produced by diluting 50.00 mL of a 3.79 M solution to 2.00 L?

  • A 3.8 M solution of iron (II) sulfate is diluted to eight times its original volume. What is the new molarity of the solution?


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