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Chapter 18 - Brady(1)-Addend-1

Chapter 18 - Brady(1)-Addend-1 - Polyprotic Acids Acids...

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Acids that can donate more than one H + to solution are called polyprotic acids Table 18.3 (and Appendix C) list the ionization constants of a number of polyprotic acids The ionization constants for these acids are numbered to keep track of the degree of ionization Note that, for a given polyprotic acid, the magnitudes of the ionization constants are always: K a1 > K a2 (> K a3 , if applicable) Polyprotic Acids
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Suppose some H 3 PO 4 is added to water, using the constants in Table 18.3: 13 2 4 3 4 3 3 4 2 4 8 4 2 2 4 2 2 4 4 2 3 4 3 4 2 1 4 2 4 3 10 5 . 4 ] [ ] ][ [ ) ( ) ( 10 3 . 6 ] [ ] ][ [ ) ( ) ( 10 1 . 7 ] [ ] ][ [ ) ( ) ( - - - + - + - - - - + - + - - - + - + × = = + × = = + × = = + HPO PO H K PO aq H aq HPO PO H HPO H K HPO aq H aq PO H PO H PO H H K PO H aq H aq PO H a a a Example: Phosphoric Acid
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The total [H + ] is then This is generally true when any polyprotic acid is added to water This greatly simplifies the determination of the pH in solutions of polyprotic acids.
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