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Acid base titrations

# Acid base titrations - Date Performed Date Submitted...

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Date Performed: 3/21/07 Name: Sean Saksena Date Submitted: 3/28/07 Partner: Jerry C. Instructor: Sen Acid Based Titrations Objective: To standardize a sodium hydroxide solution by its reaction with hydrochloric acid solution of known concentration The determine the molar mass of an unknown , monoprotic acid To determine the percentage of acetylsalicylic acid in an aspirin tablet Experimental Data : Part A: Sample A: 20.7 ml of NaOH required to titrate 25ml of .200 M HCl Sample B: 21.4 ml of NaOH required to titrate 25 ml of .200 M HCl Part B: Sample A: 17.1 ml of NaOH required to titrate 1.0g of unknown acid Sample B: 20.3 ml of NaOH required to titrate 1.0g of unknown acid Part C: Mass of aspirin tablet: 0.368g 6ml of NaOH needed to titrate 0.368g of aspirin Sample Calculations: Part A: Strength of base Molarity (NaOH) = (Molarity (acid) x Volume (acid) ) / (Volume (NaOH) ) M (NaOH) = [(0.2000M)(0.0250L)] / (0.0207L) = 0.2400M (sample 1) M (NaOH) = [(0.2000M)(0.0250L)] / (0.0214L) = 0.2300M (sample 2) Calculated average: [M (NaOH sample 1) + M (NaOH sample 2) ] / 2 Avg Molarity = [0.2400 + 0.2300] / 2 = 0.2350 M (NaOH)

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Part B: Calculating Mole Mass of acid Strength of base = 0.2350M
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Acid base titrations - Date Performed Date Submitted...

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