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What is the temperature required for the decomposition of CaCO3 in degree Celsius?

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What is the temperature required for the decomposition of CaCO3 in degree Celsius?

(a) 200

(b) 500

(c) 900

(d) 1200

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My question comes from Thermogravimetric Analysis in section Thermal Analysis of Solid State Chemistry

1 Answer

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Best answer
Right choice is (b) 500

To explain: The decomposition in the thermogravimetric analysis of CaCO3 is completed in vacuum at ~500◦C but in CO2 at one atmosphere pressure, decomposition does not even commence until above 900◦C. Ti, Tf pertain to the particular experimental conditions, therefore and do not necessarily represent equilibrium decomposition temperatures.

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