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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?

Respuesta :

jufsanabriasa

Answer:

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.

shadrachadamu

Answer:

1. Phenol Red

2. pKa = 7.9

3. neutral red

Explanation:

pKa of indicators

The consequence of this answer is that the indicator will change colour when the pH is the same value as its pKa value. ... As the change in pH is usually large at the equivalence point this means that provided the pH change takes place through the pKa of the indicator then it can be used for a titration.

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