3) *Extra credit!* pH indicators are really weak acids, with pK, values like any

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3) *Extra credit!* pH indicators are really weak acids, with pK, values like any other weak acid. Bromocresol green is an indicator that's useful between pH values of roughly 3.5 and 6. It's pK, is 4.68 The acid and base forms of bromocresol green are shown below. (3 pts total) Br -H Br Br Br BrBr +H SO3 SO3 acid form (HA): yellow base form (A) blue Give a brief answer and explanation for the following questions: what color would you expect for a solution of pH 3.68 -pH 5.68 pH 4.68? Use the theory I discussed in class to make your predictions. I don't need to know what Google or Wikipedia have to say about i

Explanation / Answer

wen pH = 3.68 we have situation pH < pka ( 3.68 < 4.68) . Hence acid form is dominanan. Hence yellow color is expected.

when pH = 5.68 we have situation where pH > pka ( 5.68 > 4.68). Hence base form is major .

Thereforme we expect blue color

when pH = 4.68 we have situation where pH = pka = 4.68. At this point we have equal amounts of acid form and base form. Hence we observe equal amount of yellow and blue

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