Question

Why is Li₂CO₃ decomposed at a lower temperature whereas Na₂CO₃ at higher temperature? 

Answer 1

This causes an increase in the stability of alkali carbonates. However, lithium carbonate is not so stable to heat. This is because lithium carbonate is covalent. ... Therefore, lithium carbonate decomposes at a lowtemperature while a stable sodium carbonate decomposes at a high temperature.