Experiment #16 Determination of the Equivalent Mass and pKa

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

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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
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This note was uploaded on 06/02/2010 for the course CHEM 104 taught by Professor Any during the Spring '10 term at UNC Charlotte.

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

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