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The determinations of chloride against silver by gravimetric or volumetric methods are well documented in textbooks of inorganic quantitative analysis. Complications that may arise in biological liquids include the interference of other ions and the selection of suitable indicators to give colour changes detectable in the crimson of blood as a solvent. Thermometric titrimetry is a means of circumnavigating some of these difficulties — the detection of end points of titrations from the inflection point in the graph of heat evolved versus amount of titrant added. Figure III. 1.1 is a thermogram of the simplest and most well-known type of titration — the titration of alkali from a burette into mineral acid in a stirred vessel (H+ + OH− →H2O).
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