In the abstract, state which unknown you were assigned (either A or B) and then its chemical identity (e.g., acetic acid). In the data analysis section,
1. Use the titration curve to establish the precise equivalence volume to +/- 0.1 mL:
1. plotting volume of titrant vs the pH,
2. plot the first derivative of the pH (Delta pH) vs volume of titrant within +/- 1.0 mL of the equivalence volume (i.e., where pH was taken more frequently with respect to volume changes), and
3. plot of the second derivative of the pH (Delta (Delta pH)) vs volume of titrant over that same +/- 1.0 mL volume.
2. If you recall Calculus A/B, the equivalence volume occurs at (1) a local maximum in the 1st derivative plot that (2) is also an inflection point in the 2nd derivative plot (i.e., where the slope crosses the x axis).
3. Using the equivalence volume, you can then convert this to moles of the unknown using the concentration of the titrant.
4. Finally, as you have the mass of each sample, you can divide the mass by the moles to get the molar mass of the unknown.
5. From the list on the first page of the experiment, please pick out the acid or base that most closely aligns with this molar mass. This is the identity of your unknown.
6. Please do this analysis for both trials and include all six charts in the report.
If your molar mass lies somewhere between values listed on the first page of the experiment, what are some potential errors that could account for the discrepancy?
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