Chemical Indicators

In the blue of hin masks the yellow of in so solution

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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 Indicator [In-] [In [In-] pH = pKa + log [HIn] = pH = pKa + log 10 x [In-] pH = pKa - 1 …and all pH’s < pKa - 1 pH Mid-range xxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxx x -2 -1 xxxxx xxxxx xxxxx xxxxx x xxxxxxx xxxxxxx xxxxxxx xxxxxxx x pKa xxxxx xxxxx xxxxx xxxxx x xxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxx +1 +2 Summary of Titration of Strong Acid with a Strong Base with There 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) (The Any Any indicator with a color change within this range (4 « 7) can be used to signal the end point of the titration. the...
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This document was uploaded on 02/18/2014 for the course CHEM 1212 at Clayton.

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