Chapter-11-Notes

Chapter-11-Notes - two units over which it changes color....

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Chemistry 300L Lecture Notes for Chapter 11 page 1
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Chemistry 300L Lecture Notes for Chapter 11 page 9 Indicators These are acidic molecules whose acid and conjugate base forms are different in color. They are usually organic dyes with lots of aromatic rings and lots of conjugating groups. Thymol blue at the right is an example. As shown below, each indicator has its own p K a with a corresponding pH range of about
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Unformatted text preview: two units over which it changes color. Chemistry 300L Lecture Notes for Chapter 11 page 10 Two points regarding indicators are especially important. 1) Select an indicator whose p K a is a close as possible to the pH of the analyte at its endpoint, as shown below for an analyte whose equivalent point is at pH = 5.54. At the endpoint, very small changes in volume of added acid or base cause large changes in pH, so there is less likelihood of an indicator error. 2) Use only a few drops of indicator solution as small an amount as will give a good endpoint. Since the indicator is also in effect being titrated by the added reagent, its concentration MUST be negligible with respect to that of the analyte....
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This note was uploaded on 10/26/2008 for the course CHEM 300L taught by Professor Flood,haw during the Fall '08 term at USC.

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Chapter-11-Notes - two units over which it changes color....

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