Indicator pKa Versus Solution pH
A researcher attempts to determine the exact pH of a solution by using an acid-base indicator, assuming that the pH at which the indicator changes color is equal to the solution’s pH. What is the fundamental conceptual error in this assumption?
A
Confusing the indicator’s pKa with the solution’s pH
B
Overestimating the precision of pH indicators
C
Assuming the indicator’s color change point exactly matches the solution pH
D
Misinterpreting the role of indicators in pH measurement
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