Question

Ageing factors which effect the gravimetricprecipitation

Answer 1

In precipitation gravimetry an insoluble compound forms when we add a precipitating reagent, or precipitant, to a solution containing our analyte. In most methods the precipitate is the product of a simple metathesis reaction between the analyte and the precipitant; however, any reaction generating a precipitate can potentially serve as a gravimetric method.

Most precipitation gravimetric methods were developed in the nineteenth century, or earlier, often for the analysis of ores. Figure 1.1 in Chapter 1, for example, illustrates a precipitation gravimetric method for the analysis of nickel in ores.

8.2.1 Theory and Practice
All precipitation gravimetric analysis share two important attributes. First, the precipitate must be of low solubility, of high purity, and of known composition if its mass is to accurately reflect the analyte’s mass. Second, the precipitate must be easy to separate from the reaction mixture

Answer 2

Answer:

Ageing factors which effect the gravimetricprecipitation

Explanation:

Common ion effect and solubility product principles

•  Conditions for good precipitation
•  Factors affecting precipitation like acid, temperature, nature of solvent
•  Super saturation and precipitation formation
•  Precipitation from homogeneous solution and examples
•  Co-precipitation, post-precipitation and remedies for their minimization
•  Washing of precipitate and ignition of precipitate
•  Brief idea about method of filtration and drying of precipitate
•  Introduction to electrogravimetry: principle, applications, electrolytic separations of Cu and Ni

Gravimetric analysis is a technique through which the amount of an

analyte (the ion being analyzed) can be determined through the

measurement of mass.

•  Gravimetric analyses depend on comparing the masses of two compounds containing the analyte.
•  The principle behind gravimetric analysis is that the mass of an ion in a pure compound can be determined and then used to find the mass
• percent of the same ion in a known quantity of an impure compound.
•  In order for the analysis to be accurate,certain conditions must be met:

-The ion being analyzed must be completely precipitated.

-The precipitate must be a pure compound.

-The precipitate must be easily filtered.

Ageing factors which effect the gravimetricprecipitation

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