calculation of Molarity of a solution.

Jun 2nd, 2015
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Concentration of an Aqueous Solution - Molarity, Calculations Involving Molarity

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UNIT 5Aqueous Reactions andSolution StoichiometryMolarityConcentration of an AqueousSolution - MolarityAn important property of a solution is itsconcentration: the amount of solute dissolved in agiven quantity of solvent.There are many ways to express concentration. Wewill learn one: molarity.Molarity (symbol M) = moles of solutevolume of solution in litersMolarity can be treated as a conversion factor (likedensity) to go from volume of a solution to moles ofsolute and vice versa.Two Ways Calculate MolesYou now know two ways to calculate thenumber of moles of a substance.1. If you have a known mass of the substance,you divide by the molar mass to get moles.mass of A x1 mol A= mol Amolar mass of A2. If you have a known volume of a solution ofknown molarity, you multiply the volume of thesolution in liters by the molarity to get moles.liters of solution of A x molarity of A = mol ACalculations Involving MolarityHow to prepare 1.00 liter of a 1.00 M solutionof copper(II) sulfate:1.00 L x 1.00 mole CuSO4 = 1.00 mole CuSO41 L solution1.00 mole CuSO4 x 159.61 g CuSO4 = 160. g CuSO41 mole CuSO4Put 160. g CuSO4 in a 1L volumetric flask. Fillabout full with deionized (DI) water andswirl to dissolve. Fill to the mark with DIwater and up end the flask to mix.Calculations Involving MolarityHow to prepare 250.0 mL of a 1.00 M solutionof copper(II) sulfate:250.0 mL x 1 L x 1.00 mole CuSO4 = 0.250 mole CuSO41000 mL 1 L solution0.250 m

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