Chapter 13 - Chapter 13 Titrimetric Methods Titrimetric...

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Chapter 13 Titrimetric Methods Titrimetric methods include a large and powerful group of quantitative procedures based on measuring the amount of a reagent of known concentration that is consumed by an analyte. Volumetric titrimetry involves measuring the volume of a solution of known concentration that is needed to react essentially completely with the analyte. Gravimetric titrimetry differs only in that the mass of the reagent is measured instead of its volume. In coulometric titrimetry , the ‘reagent’ is a constant direct electrical current of known magnitude that consumes the analyte.
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Defining Some Terms A standard solution (or a standard titrant) is a reagent of known concentration that is used to carry out a titrimetric analysis. A titration is performed by adding a standard solution from a buret or other liquid-dispensing device to a solution of the analyte until the reaction between the two is judged complete. The volume of reagent needed to complete the titration is determined from the difference between the initial and final volume readings. The equivalence point in a titration is reached when the amount of added titrant is chemically equivalent to the amount of analyte in the sample.
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Equivalence Points and End Points The equivalence point of a titration cannot be determined experimentally. Instead, we can only estimate its position by observing some physical change associated with the
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Chapter 13 - Chapter 13 Titrimetric Methods Titrimetric...

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