Suppose you have an indicator that turns from yellow to red over a pH range of 6.4 to 8.0, respectively. Fill in the blanks for each of the following. What color is the acidic form of the indicator? yellow What is the pKa of the indicator? What color is the indicator when pH = pKa?

pKa of indicator: 7.2

The indicator is yellow in acidic form

When pH = pKa, indicator will be Orange

Explanation:

pKa of a indicator is in the middle of its virage. That is

(6.4 + 8.0) / 2 = 7.2

The indicator is yellow in acidic form and red in the basic form. When pH = pKa, the indicator will be the half yellow and the half red, by colour theory, red + yellow = indicator will be Orange.

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