Li2CO3 decomposes readily whereas other carbonates are not. Why?

1.	Li2CO3 decomposes readily whereas other carbonates are not. Why?
Answer» The carbonates (M₂CO₃ ) of alkali metals are remarkably more stable up to 1270 K above which they first melt and then decompose to form their oxides, whereas Li₂CO₃ is less stable and Li₂CO₃ + ∆ → Li₂O + CO₂↑ This is due to the large size difference between Li and \(CO_3^{2-}\) which makes the crystal lattice unstable.

Answer»

The carbonates (M₂CO₃ ) of alkali metals are remarkably more stable up to 1270 K above which they first melt and then decompose to form their oxides, whereas Li₂CO₃ is less stable and Li₂CO₃ + ∆ → Li₂O + CO₂↑

This is due to the large size difference between Li and \(CO_3^{2-}\) which makes the crystal lattice unstable.

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Li2CO3 decomposes readily whereas other carbonates are not. Why?

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