Experiment #16 Determination of the Equivalent Mass and pKa

Experiment #16 Determination of the Equivalent Mass and pKa...

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Experiment 16 Determination of the Equivalent Mass and pKa of an Unknown Aci Part 1: Preparation and Standardization of Approximately .012M NaOH Trial No. Mass KHP Volume NaOH [NaOH] (gm) (ml) (M) 1 0.4220 19.90 0.1038 2 3 Average 0.1038 204.22 g/mol Part 2: Determination of the Equivalent Mass of an Unknown Acid Trial No. Mass Unknown Volume NaOH (gm) (ml) (g/mol) 1 0.1314 24.10 52.51 2 0.1316 24.11 52.57 Average 52.54 Part 3: Determination of the pKa of the Unknown Acid Mass Unknown Acid needed 0.1091 gm Mass Unknown Acid used 0.1314 gm Volume Change in pH pH Data and Calculations: (ml) 3.00 0.0 2.71 ---- 1.00E-03 1.0 2.75 0.04 0.00 2.0 2.85 0.10 NA 3.0 2.92 0.07 Endpoint Volume 21.2 4.0 3.01 0.09 2 5.0 3.09 0.08 52.51 6.0 3.18 0.09 52.57 7.0 3.32 0.14 59.69 8.0 3.49 0.17 54.92 9.0 3.65 0.16 Molar Mass 109.84 9.5 3.85 0.20 Percent Deviation 5.79 9.8 3.95 0.10 104.06 10.0 4.05 0.10 Percent Error 5.56 10.2 4.10 0.05 10.4 4.21 0.11 10.6 4.30 0.09 10.8 4.32 0.02 11.0 4.34 0.02 12.0 4.75 0.41 13.0 4.97 0.22 MW KHP EM unknown OH - added pK a1 K a1 pK a2 K a2 No. H + /molecule EM Part2 EM Part2 EM graph EM average Molar Mass actual
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14.0 5.15 0.18 15.0 5.46 0.31 16.0 5.64 0.18 17.0 5.79 0.15 18.0 5.96 0.17 19.0 6.23 0.27 20.0 6.65 0.42 20.8 6.97 0.32 21.0 7.79 0.82 21.2 9.95 2.16 21.4 10.76 0.81 21.6 10.98 0.22 21.8 11.50 0.52 22.0 11.90 0.40 23.0 12.22 0.32 24.0 12.33 0.11
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id enter 0 if monoprotic ml 1=mono-, 2=diprotic g/mol g/mol g/mol g/mol g/mol % g/mol %
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