Spectroscopic data for the indicators thymol blue (TB), semithymol blue (STB), and
Chapter 18, Problem 18-6(choose chapter or problem)
Spectroscopic data for the indicators thymol blue (TB), semithymol blue (STB), and methylthymol blue (MTB) are shown in the table. A solution of TB, STB, and MTB in a 1.000-cm cuvet had absorbances of 0.412 at 455 nm, 0.350 at 485 nm, and 0.632 at 545 nm. Modify the spreadsheet in Figure 18-5 to handle three simultaneous equations and find [TB], [STB], and [MTB] in the mixture. (nm) TB STB MTB 455 4 800 11 100 18 900 485 7 350 11 200 11 800 545 36 400 13 900 4 450 SOURCE: S. Kiciak, H. Gontarz, and E. Krzyz. anowska, Monitoring the Synthesis of Semimethylthymol Blue and Methylthymol Blue, Talanta 1995, 42, 1245.
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