(5) For a final exercise, using the absorbance spectrum of bromocresol green at various pH values pH -2.12
2
2.4
Amax = 620 nm
1.8
2.64
2.94
1.6 amax = 435 nm
3.2
1.4
-3.8
1.2
4.13
1 -
4.6
4.9
0.8
5.17
0.6
5.9
Absorbance
0.4
0.2
0
400
450
500
550
600
650
700
Wavelength / nm
shown below, describe to the reader what they are observing and how an absorbance titration would
allow for a more accurate calculation of the pk, of bromocresol green. Recall that molecules absorb
light, and instruments and humans see transmitted light (color opposites). The expectation is a
paragraph of at least 120 words in complete sentences with all references cited.