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Solution Concentration

Solution Concentration - Solution Concentration 1 Solution...

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Solution Concentration 1 Solution Concentration and Dilution Why? You can determine the number of molecules or moles present from the volume of  a solution, provided you know the concentration of the solution.  You will encounter  problems and situations in this course, other courses, and many jobs, where you  need to know the concentration of solutions.  Laundry detergents, medicines, food  products, cosmetics, steel, gasoline, and many other materials must contain specific  amounts of certain chemical compounds to have desired properties.   Learning Objectives Use the concept of molarity. Determine how concentration changes upon dilution. Success Criteria Accurate calculations of solution concentration. Accurate conversion of concentration into the amount (moles or mass) of  material. Resources Olmsted and Williams ( Chemistry 3/e , Wiley, 2002) pp.  113-120. Prerequisites Mole and Molar Mass, Mass-Mole-Number Conversions Information A solution is formed when one substance is dissolved in another.  The substance  present in the larger amount is called the  solvent  and the other substance is called  the  solute .  Water is a common solvent, and solutions involving water as the solvent  are called  aqueous solutions  (abbreviated aq).
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Solution Concentration 2 Model : Preparation of a Standard Solution Water is added to a 500 mL volumetric flask well below the calibration mark. 58.8 g  (0.200 mol) of potassium dichromate are transferred to the water in the flask.  The  solid is dissolved, and additional distilled water is added to bring the water level to  the 500 mL mark on the flask.   The concentration of the potassium dichromate  solution is 0.400 M. concentration = (amount of solute) / (amount of solution) molarity (M) = (moles of solute) / (liters of solution) 0.400 M = 0.200 mol/0.500 L [K BBB 2 Cr BBB 2 O BBB 7 ] = 0.4 M
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