Lecture 6. Intro to Titration

Lecture 6. Intro to Titration - Quality Assurance and...

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Unformatted text preview: Quality Assurance and Calibration Methods Methods (Chapter 5) • Quality Assurance Quality • Validation Validation • Standard Addition Standard • Internal Standards Internal => Week 11 of this semester Titrations Titrations Chapter 6 Daniel C. Harris, Exploring Chemical Analysis, 3rd ed., W.H. Freeman and Company, New York, 2005. Freeman Titrations Titrations http://www.metrohmusa.com http://www.chem.ualberta.ca/~iip/chem211irc/TitrationVideo.html Calcium Titration with EDTA Calcium http://www.chem.ualberta.ca/~iip/chem211irc/TitrationVideo.html EDTA Calcium Titration with EDTA Calcium In- (Eriochrome T) http://www.chem.ualberta.ca/~iip/chem211irc/TitrationVideo.html EDTA Calcium Titration with EDTA Calcium n << m ? n=m? n >> m ? >> In- (Eriochrome T) Why are titrations so useful in analytical chemistry? chemistry? Example: Precipitation Titration Example: Hg22+ + 2 IO3- Hg2(IO3)2 (solid) * 25 mL 0.04132 M Hg2(NO3)2 * 0.05789 M KIO3 * Ksp of Hg2(IO3)2 = [Hg22+] x [IO3-]2 = 1.3 x 10-18 Ksp => Where is the equivalence point? => => [Hg22+] at 35.00 mL? => => [Hg22+] at 36.00 mL? => at Example: Precipitation Titration Example: Hg22+ + 2 IO3- Hg2(IO3)2 (solid) * At what volume of added IO3- does the concentration of Hg22+ become 0 M? Hg ...
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