Figure 2 Titration of Second Vinegar Sample with Sodium Hydroxide Vinegar

Figure 2 titration of second vinegar sample with

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Figure 2: Titration of Second Vinegar Sample with Sodium Hydroxide Vinegar Sample 1 Vinegar Sample 2 Vinegar Sample 3 Mass of Vinegar 4.95 5.1 4.9 Volume of Vinegar Density = 1.005 g/mL 130 137 135 Initial NaOH volume in syringe 8 9.5 10.2 Final NaOH volume in syringe 3.8 3.6 4.1 Volume of NaOH Delivered 6 7.2 7.8 Moles of NaOH Delivered 0.0942M .097 M .095M Moles of Acetic Acid in Sample 0.84M 0.84M 0.844M Mass of Acetic Acid in Sample 2.02 g 2.01 g 2.01 g Calculated Molarity of Acetic Acid in the sampled vinegar 0.791 M 0.789 M 0.790 M Calculated Percent Mass of Acetic Acid in sampled vinegar 3.8% 3.49% 3.71% Average Calculated Percent Mass of Acetic Acid in Sampled Vinegar 3.7% Figure 3 : Titration of Vinegar by Sodium Hydroxide Vinegar Sample 1 Vinegar Sample 2 Vinegar Sample 3 Initial pH Reading pH = 3.211 pH = 3.102 pH = 3.105 Initial Buret Reading 2.89 mL 3.00 mL 1.61 mL Midpoint pH Reading pH = 4.895 pH = 4.687 Midpoint Buret Reading 12.92 mL 9.50 mL
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Mejia - 7 - Final pH Reading pH = 8.238 pH = 8.531 pH = 8.934 Final Buret Reading 20.12 mL 20.31 mL 19.00 mL Volume of NaOH Consumed 17.24 mL 17.31 mL 17.38mL Calculated Molarity of Acetic Acid in the Vinegar Sample 0.86M 0.87M 0.86M Volume NaOH Consumed at Midpoint Reading 8.46 mL 8.7M Moles of NaOH Consumed at Midpoint Reading [A–] 0.04398M 0.042M Moles of Acetic Acid Remaining at Midpoint [HA] .01759M 0.175M Calculated pK a 4.289 4.314 Average calculated molarity of acetic acid ______0.86M_____________________ Average acetic acid concentration expressed in percent by mass ____17.2mL_______ Average value of pK a of acetic acid based on provided experimental data ___4.3_________ Percent error for pK a of acetic acid ___7.9%________ References Determination of Acetic Acid Concentration in Vinegar Using Titration. 2015. Carolina Biological Supply Company: Carolina Distance Learning Investigation Manual. Accessed 3/9/2020
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  • Fall '08
  • ROGERS
  • pH, Sodium hydroxide, Marta Mejia

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