What is common source of errors in thermogravimetric analysis (TGA)? A mixture of CaO and is analysed by TGA. The result indicates that mass of the sample decreases from
to
only between
and
. Calculate the percentage of calcium carbonate in the mixture.
In thermogravimetric analysis (TGA), common sources of errors include instrumental drift, buoyancy effects, incomplete decomposition, adsorption of moisture, sample inhomogeneity, and improper heating rate. These can lead to inaccurate mass loss readings. For the given problem, we calculate the percentage of calcium carbonate ((CaCO_3)) in the ______ ______ _______ ______ _______ _______ __________.
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Indium and Cadmium ions in 0.1 M HCl give peaks at potentials -0.557 V and -0.597 V by differential pulse polarographic analysis. When a standard solution containing 0.4 ppm of indium is analysed, it gave peak current (in arbitrary units) corresponding to 100.25 at -0.557 V and 43.75 at -0.597 V. A standard solution containing 0.4 ppm of Cd gave ip 29.52 at -0.557 V and 64.8 at -0.597 V. What is the concentration of indium and cadmium in a sample if the peak current is 190 at -0.557 V and 120 at -0.597 V.