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Question 9 1 pts Suppose you have an indicator that is diprotic and has pK 1 - 3 and pK2 - 7. If Heln is yellow, Hinis red,
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Answer #1

Q9. What species is/are significantly present at pH of 7? : HIn- and In2-

What is the color of the indicator at a pH of 7? : magenta (combination of red and blue)

Explanation

Given : pH of solution = 7

pKa2 of indicator = 7

Hence, for the given solution, pH is at pKa2

Equal species of HIn- and In2- must be present.

The color of solution should be a mixture of red and blue which is magenta.

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