Introduction to Titrimetry

Introduction to Titrimetry - Introduction to titrimetry...

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Unformatted text preview: Introduction to titrimetry concepts and calculations Jonyl L. Garcia 2/2/12 02:45:02 PM 1 J. Garcia 2012 Definition of Terms Ø Titrimetry Ø Includes a group of analytical methods based on determining the quantity of a reagent of known concentration that is required to react completely with the analyte. The reagent may be a standard solution of a chemical or an electric current of known magnitude. 2/2/12 02:45:03 PM 2 J. Garcia 2012 Types of Titrimetry Ø Volumetric Titrimetry Ø A type of titrimetry in which the standard reagent is measured volumetrically Ø Gravimetric Titrimetry Ø Differs in that the mass of the standard reagent is measured instead of volume. Ø Coulometric Titrimetry Ø The quantity of charge in 2/2/12 02:45:03 PM 3 J. Garcia 2012 Definition of Terms Ø Standard Solution (Standard Titrant) Ø A reagent of known concentration that is used in a titrimetric analysis. Ø Titration Ø A process in which a standard reagent is added to a solution of an analyte until the reaction between the anayte and the reagent is judged to be 2/2/12 02:45:03 PM 4 J. Garcia 2012 2/2/12 02:45:03 PM J. Garcia 2012 5 Definition of Terms Ø Back titration Ø A process in which the excess of a standard solution is used to consume an analyte is determined by titration with a second standard solution. It is often required when the reaction rate between the analyte and reagent is slow or when the standard solution lacks stability. 2/2/12 02:45:03 PM 6 J. Garcia 2012 Definition of Terms Ø Equivalence point Ø The point in a titration when the amount of added standard reagent is equivalent to the amount of the analyte. Ø End point Ø The point when a physical change occurs that is associated with the condition of chemical equivalence. 2/2/12 02:45:03 PM 7 J. Garcia 2012 Titration Error ET = Vep - Veq Veq = theoretical volume of reagent required to reach equivalence point Vep = the actual volume used to arrive at the end point 2/2/12 02:45:03 PM 8 J. Garcia 2012 Indicators Component of a titration process used to judge the completion of the reaction. Could be a chemical reagent that could give an observable physical change at the equivalence point (or end point) [e.g. phenolphthalein, bromocresol green, starch] An instrument the measures a certain property of the titration mixture that could indicate the completion of a reaction. [e.g....
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Introduction to Titrimetry - Introduction to titrimetry...

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