You are testing a newly discovered pH indicator which has a K_a of 5.0 times 10^

Question

You are testing a newly discovered pH indicator which has a K_a of 5.0 times 10^-8. You carefully prepare a solution of 0.0023 M indicator in solutions of 0.5 M HCl, 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. What is the pH of solution A, which contains 0.0023 M indicator? 7.03 What is the pH of solution B, which contains an undetermined amount of indicator? 7.03 Copy the data to Excel and use "Chart" to plot a graph as illustrated above. Print the Excel plot and turn it in to your lab instructor, along with equations showing how you calculated the pH.

Explanation / Answer

With no indicator present. pH will only depend on the solution concentration

pH= 8-Log5

pH= 8-0.698
pH= 7.302

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