Cliffs AP Chemistry, 3rd Edition

Figure 1

Various known concentrations of the stock solution of the complex ion were colormetrically
analyzed and a Beer’s law plot drawn (see Figure 2). The ASA that was produced was then
treated as described earlier and then colorimetrically analyzed with the concentration deter-
mined through extrapolation of the Beer’s law plot.

Finally, a small sample of the ASA was determined to have a final melting point of 134°C.

Figure 2

Absorbance

Molarity (M × 10 −^4 )

Beer's Plot-Salicylate Complex

1

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

0

0.5 1.5 2.5 3.5 4.5

400

0.80

0.70

0.60

0.50

0.40

absorbance

wavelength, nm

0.30

0.20

0.10

500 600 700

316

Part III: AP Chemistry Laboratory Experiments