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 mixture: Step 1: Determine the mass loss Initial mass of sample: ( _________ ________ ___ _____ ___ ___ ____ __________ _____ ____ _____ ________.
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In a coulometric method, 200 mg of nitrobenzene in of methanol is reduced to phenyl hydroxylamine at a constant potential of -0.95 V (vs. SCE) applied to an Hg electrode. Following reaction takes 30 minutes to complete.
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Calculate the percentage of nitrobenzene if above reduction requires 32mA current.
voltammetry and polarography
What is Coulometer? Explain briefly. Write cathodic and anodic reaction of hydrogen-nitrogen coulometer, where 0.1 M hydrazine sulphate is used as the electrolyte.
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Explain how thermometric titrations are different than classical titrations. Discuss their advantages.
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