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I learnt this one in school at the age of 11 years.

CaCO3(s) ===heat===> CaO(s) + CO2(g)

Is the thermal decomposition of calcium carbonate.

You need to heat the Calcium carbonate to 'red' heat (1000 oC). where upon CO2 is liberated.

In an experiment you can not see any change in calcium carbonate (CacO3) is white in colour as is Calcium Oxide (CaO). The two ways to check for the liberation of CO2 is :-

  1. When cooled the residue solid(CaO) should weigh less, then before the experiment. or

  2. Collect the liberated CO2 and bubble through lime water; it turns 'milky' in colour.

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lenpollock

Lvl 17
4y ago

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