Handout10-ComplexTitrations

Handout10-ComplexTitrations - CEM 834 COMPLEXATION...

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CEM 834 COMPLEXATION TITRATIONS FALL 2005 The titration of a metal ion (M z+ ) with a complexing agent such as ethylenediaminetetraacetic acid (H 4 Y) can be solved analytically in a manner similar to that developed for acid–base titrations. Complexation titrations are often more complicated because the metal ion can form complexes with the buffer species or with masking agents (MA n ), and the ligand may be present in a variety of protonated forms (H 4 Y, H 3 Y , H 2 Y 2– , HY 3– , Y 4– ). Because both the metal ion and the ligand must be free in order to form a complex, the overall reaction is: ( 29 ( 29 [ ] [ ] [ ] M Y MY K K MY M Y z 4 (z 4) c f c f 0 MA H 4 Y (z 4) T,n T,n n + - - - + = = ' α α 0 A solution of the metal ion with concentration C 0 and volume V 0 is titrated using a solution of the ligand with concentration C and volume V. To determine the titration curve, the concentration of free metal ion (pM z+ = – log[M z+ ]) is calculated as a function of the fraction titrated ( Φ ). A.
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Handout10-ComplexTitrations - CEM 834 COMPLEXATION...

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