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acid-base titrations - Date Performed Date Submitted...

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Date Performed: 5/1/10 Name: Joe Staba Date Submitted: 5/8/10 Partner: Alyssa S. Instructor: Zhibing Xu Acid-Base Titrations Objective: The objective of this lab was to standardize a sodium hydroxide solution by its reaction with a hydrochloric acid solution of known concentration. Also to determine the molar mass of an unknown, monoprotic acid and to determine the percentage of acetylsalicylic acid in an aspirin tablet. Experimental Data: Part A: HCl Molarity = .200 mol/L 1 st Trial Volume HCl = 25.0 mL of HCl 2 nd Trial Volume HCl = 25.0 mL of HCl Volume of NaOH used in Titration 1 st Trial = 21.5 mL ± 0.01 mL 2 nd Trial = 21.5 mL ± 0.01 mL Part B: Unknown Acid Mass Trial 1 = 1.00 g ± 0.01 g Unknown Acid Mass Trial 2 = 1.00 g ± 0.01 g NaOH Titration Volume Used Trial 1 = 20.5 mL NaOH Titration Volume Used Trial 2 = 20.5 mL
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Part C: Mass of Aspirin Tablet = .37 g ± 0.01 g Volume of NaOH Titration 8.0 mL ± 0.0 mL Sample Calculations: Part A: Molarity HCl x L HCl = mol HCl = (0.200 M) x (0.0250 L) = 0.005 mol HCl Mol HCl = Mol NaOH = 0.005 mol HCl = 0.005 NaOH Molarity NaOh = mol NaOH/ L NaOH = (0.005 mol) / (0.0215 L) = 0.234 M NaOH
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