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Unformatted text preview: formed at endpoint; titration of Ag + in HNO 3 (no CO 3 2- , C 2 O 4 2-, AsO 4 3-interference) Cl-precipitated by excess AgNO 3 ; after filtration, excess Ag + titrated with standard KSCN in the presence of Fe 3+ Ag + + SCN-! AgSCN (s) SCN-+ Fe 3+ ! FeSCN 2+ (red) ! Fajans Titration: colored indicator (anionic dyes) adsorbed on precipitate at endpoint e.g., dichlorofluorescein (greenish yellow initially; turns pink when adsorbed to AgCl ! Silver salts and adsorption indicators light-sensitive Adsorption Indicators Lattice anions and cations Adsorbed more likely than Non-lattice solution ions Spectrophotometric Titrations Spectrophotometric Titrations Calculating Titration Curves with a Spreadsheet...
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This note was uploaded on 02/15/2010 for the course CHEM 316 taught by Professor Soriaga during the Fall '08 term at Texas A&M.
- Fall '08