Understanding About the Homogeneous Precipitation
Synthesis and thermal analysis of the group 2(IIA) metal oxalate
hydrates
Objective :
1. To run the synthesis of calcium oxalate via the precipitate from
solution containing calcium ion and oxalate ion.
2. To do a thermo gravimetric analysis on calcium oxalate.
3. Understand and practice the method of homogeneous precipitation
through this experiment.
Introduction
Thermo gravimetric analysis (TGA) is one of the common analytical
thermal analysis techniques that widely use to determine the thermal
profile and stability of compound. This is rather important in the
industry. When the thermal profile of certain substance was know, it
can be produce in large quantity by an accurate reaction with the
lowest cost. With the TGA techniques, a sample of material is being
heated, while the sample mass is recorded as a function of
temperature. By doing so, the composition of the material is analyzed,
both qualitatively (which components are present in the material) and
qualitatively (how much of these components is present).
In this experiment, synthesis and thermo gravimetric analysis of
calcium oxalate has been carried out. Synthesis of calcium oxalate was
done by the reaction between calcium ions and oxalate ion:
Ca2+(aq) + C2O42-(aq) arrow CaC2O4(s)
In which prepared via precipitation from solution at about pH 5 called
homogeneous precipitation. Since calcium oxalate is an oxalic acid, it
dissolve in acidic solution, to make the calcium oxalate form
precipitate, the solution was adjust to more basic by addition of
ammonia, but this is not done by adding the ammonia solution directly
into the solution. Conversely, make the ammonia forms slowly within
the solution through the reaction of hydrolysis of urea:
(H2N)2C=O + H2O arrow 2NH3 + CO2
Urea is a suitable compound in this reaction because it can decomposed
easily to form ammonia.During the experiment, the solution was heated
after urea has been added in, this is to increase the degree of
hydrolysis of urea and therefore increase the formation of ammonia.
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