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 BHSS Chemistry
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 Study Guide:  Solutions

"If you're not a part of the solution, then you're a part of the precipitate." --Steven Wright

  Students should be able to...

  • Define:  soluble, solute, solvent, solution, electrolyte, nonelectrolyte, types of solutions (combination of phases), saturated, unsaturated, supersaturated, dilute, concentrated, aqueous, etc.
  • List factors that affect solubility
  • Calculate Molarity.
  • Calculate molality.
  • Calculate % by mass
  • Calculate changes in freezing point and boiling point in molecular solutes
  • Calculate changes in freezing point and boiling point in ionic solutes
  • Make solutions of known volume and Molarity (laboratory)
  • Standardize a NaOH solution by titration (laboratory)

    Two sections:
    · Part I: Fill in the blank - terms; definition will be given, you provide the term name
    · Part II: Problem Solving

    Sample problems!

    1. A solution is prepared by mixing 1.0 grams of benzene (C6H6) in 100 g of water to create a solution total volume of 100 ml. Calculate the molarity, mass percent, and molality of benzene in the solution. (0.128M, 0.99%, 0.128m)

    2. 10 grams of salt (NaCl) is added to 100 mL of water. What are the new freezing and boiling points? (Kb = .51 oC kg/mol, Kf = 1.86 oC kg/mol) (-6.3 deg C, 102 deg C)

    3. Calculate the molarity of a solution that contains 1.22 grams of hemoglobin (MW = 68300) in 165 ml of solution. (1.08 X 10-4 M)

    4. How much solute was used to make a 40% solution of NaCl in H2O if 150 grams of water were used? (100. g NaCl)

    5. Find the molality of a solution of 85 g KNO3 and 125 g H2O. (6.73 m)

    6. What is the freezing point of a solution containing 202 g C12H22O11 and 750 g of H2O? (-1.46 deg C)

    7. What is the boiling point of a solution containing 110 g CaSO4 and 234 g H2O? (103.59 deg C)

    8. How many grams of Al(OH)3 are needed to make 300 mL of a 0.43M solution? (10.1 g)

    9. How many moles of PbSO4 are needed to make 200 mL of a 3.7M solution? (0.74 mol)

    10. What is the volume, in mL, of a 1.7M solution that contains water and 284 grams of C6H12O6? (930 mL)

 

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Last updated on April 28, 2006 9:18 AM