When an alkaline earth carbonate is heated, it releases CO₂, leaving the metal oxide. The temperature at which each Group 2A(2) carbonate yields a CO₂ partial pressure of 1 atm is Carbonate Temperature (°C)MgCO₃ 542CaCO₃ 882SrCO₃ 1155BaCO₃ 1360(b) Mixtures of CaCO₃ and MgO are used to absorb dissolved silicates from boiler water. How would you prepare a mixture of CaCO₃ and MgO from dolomite, which contains CaCO₃ and MgCO₃?