You are testing a newly discovered pH indicator which has a K, of 3.2 x 106. You carefully prepare a solution of 0.0034 M indicator in solutions of 0.5 M HCI, 0.5 M NaOH, and in unknown solution A. Then you put an undetermined amount of indicator into unknown solution B. You measure the visible absorption spectra of each of the four solutions. The data is illustrated in the graph and given in the table. 1.2 1.0 0.8 0.6 0.4 0.2 Absorbance 450 --0.5 MHC -0.5 M NaOH Sol A 500 550 600 650 Wavelength (nm) What is the pH of solution A, which contains 0.0034 M indicator? 5.18

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Spectroanalytical Methods

Spectroanalytical methods measure the wavelength and intensity of radiations that are either emitted or absorbed by a molecular or atomic species. These methods are useful for evaluating the electronic or atomic arrangement of the molecules of a given analyte.