Weight titrimetry

Weight titrimetry Synonymous with gravimetric titriinetiy. Weight/volume percent (w/v) The ratio of the mass of a solute to the volume of solution in which it is dissolved, multiplied by 100%. 

Two useful characterization applications involving acid-base titrimetry are the determination of equivalent weight, and the determination of acid-base dissociation constants. 

The use of weight instead of volume as a signal for titrimetry is reviewed in the following paper. 

Characterization of Samples. Fifty-five samples of dissolved humic substances were isolated and characterized during the first five sampling cruises. Characterizations of samples obtained during the first two sampling cruises included elemental analyses, molecular-weight distributions, acid-base titrimetry, solution-density determinations, stable-carbon-isotope determinations, and determinations of 13C NMR and lH NMR spectra. The... 

Gravimetric titrimetry — A - titration method in which the mass of - titrant that is added to the - titrand is weighted by using a balance [i]. 

The amount of titrant added is usually measured by volume (by dispensing the solution from a burette), and in this case, titrimetry is an example of volumetric analysis. Occasionally, the titrant is measured by weight (especially if greater accuracy is required) or by amount of electricity (as in coulometric titrations). 

The first quantitative analytical fields to be developed were for quantitative elemental analysis, which revealed how much of each element was present in a sample. These early techniques were not instrumental methods, for the most part, but relied on chemical reactions, physical separations, and weighing of products (gravimetry), titrations (titrimetry or volumetric analysis), or production of colored products with visual estimation of the amount of color produced (colorimetry). Using these methods, it was found, for example, that dry sodium chloride, NaCl, always contained 39.33% Na and 60.67% Cl. The atomic theory was founded on early quantitative results such as this, as were the concept of valence and the determination of atomic weights. Today, quantitative inorganic elemental analysis is performed by atomic absorption spectrometry (AAS), AES of many sorts, inorganic MS (snch as ICP-MS), XRF, ion chromatography (1C), and other techniques discussed in detail in later chapters. 

Titrimetry, or quantitative analysis based on the amount of a standard solution consumed in a reaction, is another valuable technique for the analysis of both major and minor constituents. It is capable of high accuracy, especially when the amount of reagent consumed is determined by weight, and in such cases accuracies of 0.01 % have been obtained. Volumetric titrimetry can readily yield results of 0.1 % accuracy. 

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