chem notes 10-03

chem notes 10-03 - October 3, 2007 Dr. Stevens Gen. Chem. 1...

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October 3, 2007 Dr. Stevens Gen. Chem. 1 Preparing aqueous solutions 1. solid + H2O 2. concentrated solution + H2O -symbol for moles (n) -Molarity => moles/L = n/V -nconcentrated = ndiluted if only H2O added -MVconcentrated = MVdiluted -example: “stock sulfuric acid = 18.0M. For lab we need 2L of 3M H2SO4. How do we make this? 1. Find Vconcentrated to use 2. get right equipment 3. dilute with H2O 1. Mconc.Vconc.= MdilVdil 18xV=3x2 => V = .33L 2. measure out .33L concentrated H2SO4 put .33L acid in 2L volumetric flask 3. add H2O to 2L line Use of concentrations in Titration Reactions -chemical reaction endpoint using stoichiometry -HCl + KOH KCl + H2O -1:1 => nHCl = nKOH at endpoint -n = MV, so nHCl = nKOH => MV (HCl) = MV (KOH) -38.21mL 0.1125M HCl was titrated to the endpoint after adding 25.00mL H2O by titrating with 25mL KOH. Calculate M of KOH. -38.21x0.1125 = 25.00xM -MKOH = 4.298625/25 = 0.1719M -what if different acid or base as sued? -H2SO4 + 2KOH
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chem notes 10-03 - October 3, 2007 Dr. Stevens Gen. Chem. 1...

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