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Unformatted text preview: ue of [HIn] masks the yellow of [In-] so solution appears blue [In-] / [HIn] = 0.10 log [In-] / [HIn] = log 0.10 = -1 So at 1 pH unit lower and below the solution appears blue Indicator Color on pH Scale
[In [In-] pH = pKa + log [HIn] = pH = pKa + log 10 x [In-] pH = pKa - 1 …and all pH’s < pKa - 1
-2 -1 xxxxx
+1 +2 Summary of Titration of Strong Acid
with a Strong Base
There is a large jump in the pH at the
equivalence point. This jump extends
from pH = 4 to about pH = 10.
(The equivalence point is at pH = 7)
Any indicator with a color change within
this range (4 « 7) can be used to signal
the end point of the titration.
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This document was uploaded on 02/18/2014 for the course CHEM 1212 at Clayton.
- Spring '09