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Quantitative Chemistry Assignment Help

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Chemistry is an experimental science that involves measurement of the magnitude of various properties of substances. Quantitative Chemistry is the study of amount or percentages of elements in various compounds. A variety of methods are employed for quantitative analyses, which for convenience may be broadly classified as chemical or physical depending upon which properties are utilized. Chemical methods depend upon such reactions as precipitation, neutralization, oxidation, or in general, the formation of a new compound. The major types of strictly chemical methods are known as gravimetric analysis and volumetric analysis.

Gravimetric Analysis

Gravimetric Analysis describes the methods in for the quantitative determination of an analyte based on the mass of a solid. Gravimetric method utilizes weight as a means of quantifying an analyte. Since weight can be measured with greater accuracy than almost any other fundamental property, gravimetric analysis is potentially one of the most accurate classes of analytical methods available. These methods are among the oldest of analytical techniques and they may be lengthy and tedious.  Samples may have to be extensively treated to remove interfering substances. As a result only few gravimetric methods are currently used in environmental analysis.

Volumetric Analysis

Volumetric or titrimetric analyses are quantitative analytical techniques which employ a titration in comparing an unknown with a standard.  In a titration, a volume of a standardized solution containing a known concentration of reactant "A" is added incrementally to a sample containing an unknown concentration of reactant "B".  The titration proceeds until reactant "B" is just consumed (stoichiometric completion).  This is known as the equivalence point.  At this point the number of equivalents of "A" added to the unknown equals the number of equivalents of "B" originally present in the unknown.  Volumetric methods have the potential for a precision of up to 0.1%.

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