MCAT Question of the Day
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    Q:

    		 pH indicators are usually organic molecules whose colors change when the pH is in the range of the indicator pKa. This is best explained by which of the following?
    		 

    A

    		 The protonation/deprotonation events occur at the half-equivalence point and change the structure and color of the indicator molecule.

    B

    		 The indicator is least stable at its half-equivalence point, causing it to change color very easily.

    C

    		 Titrations of pH indicators, being exothermic reactions, reach critical temperatures at the half-equivalence point.

    D

    		 There is no direct correlation between the pH and color of a pH indicator.



    Acid/Base Equilibria |
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