acid-base titrations

acid-base titrations - Name: Ronald Lampkins Date...

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Instructor: Mr. Lee Date Performed: October 1, 20004 Partner: Jenny Carlton Date Submitted: October 8, 2004 ACID-BASE TITRATIONS Objective : To standardize a NaOH solution by its reaction with an HCl solution of known concentration. Experimental Data: Part A: Molarity of HCL: 0.2 M HCl Number mL needed to titrate: Trial 1: 21.0 mL Trial 2: 21.3 mL Part B: Number mL needed to titrate unknown acid with NaOH: Trial 1: 19.2 mL Trial 2: 19.3 mL Part C: Mass of Aspirin: 0.37 g Number mL needed to titrate with NaOH: 1.9 mL Sample Calculations: Part A : Molarity of NaOH Trial 1: (25mL HCL)(0.20 M HCl) = (21.0mL NaOH)( x M NaOH) 5 moles HCl / 21 mL NaOH = 0.24 M NaOH Trial 2: (25mL HCL)(0.20 M HCl) = (21.3mL NaOH)( x M NaOH) 5 moles HCl / 21.3 mL NaOH = 0.23 M NaOH Average Molarity of NaOH: 0.23 + 0.24 / 2 = 0.24 M NaOH Part B: Molar Mass of an Unknown Monoprotic Acid N a =N b =M b V b Trial 1: 0.23 M NaOH x 0.0192 L NaOH = 0.004 mol acid 1 g acid / 0.004 mol acid = 250 g molar mass acid
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acid-base titrations - Name: Ronald Lampkins Date...

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