Why is `Li_(2)CO_(3)` decomposed at a lower temperature whereas `Na_(2)CO_(3)` at higher temperature?

Explanation

`Li_(2)CO_(3)` is a salt of a weak acid `(CO_(2))` with a weak base `(LiOH)`. Since the weak base cannot attract `CO_(2)` strongly, therefore, `Li_(2)CO_(3)` decomposes at lower temperature. On the other hand, `NaOH` is a much stronger base than `LiOH` and hence can attract `CO_(2)` more strongly. Therefore, `Na_(2)CO_(3)` is much more stable than `Li_(2)CO_(3)` and hence decomposes at much higher temperature than `Li_(2)CO_(3)` .