Question
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.
Answer :
Word Count : 233
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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: ( m_i = 250.6\ \text{mg} ) Final mass after decomposition: ( m_f = 190.8\ \text{mg} ) Mass loss: [ \Delta m = m_i - m_f = 250.6 - 190.8 = 59.8\ \text{mg} ] Step
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