Question

 What is common source of errors in thermogravimetric analysis (TGA)? A mixture of CaO and equation is analysed by TGA. The result indicates that mass of the sample decreases from equation to equation only between equation and equation. Calculate the percentage of calcium carbonate in the mixture. 

21 Jan 2026
Answer :
Word Count : 233
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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