Which of the following reaction represent the process of calcination?
Which of the following reaction represent the process of calcination?
Right Answer is:
CaCO3(s) → CaO(s) + CO2
SOLUTION
Calcining takes place in absence of air or oxygen to bring about a thermal decomposition. The calcining process normally takes place at temperatures above the thermal decomposition temperature but below the melting point of the product materials. The decomposition temperature is usually defined as the temperature at which the standard Gibbs free energy for a reaction is equal to zero.
For example, in limestone calcination, CaO is produced by the decomposition of lime (CaCO3) when CO2 is driven off on heating. This process is called calcination of lime and is an exothermic reaction.
CaCO3(s) → CaO(s) + CO2