Why is li2co3 decomposed at a lower temperature where as na2co3 at a higher temperature?
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Decomposition of metal carbonates means thermal decomposition by subjecting the carbonates to heat.
Thermal decomposition of metal carbonates are governed by Fajan's Rule which decides the covalent character of carbonates. The more the covalent nature of the carobonate the easier is the decomposition.
Smaller size of Li+ ion has higher polarising power than Na+ ion due to small size and high positive charge density. The higher the positive charge density the easier is the destabilization of the carbonate ion.
Hence, decomposition of Li2CO3 is easier.
Thermal decomposition of metal carbonates are governed by Fajan's Rule which decides the covalent character of carbonates. The more the covalent nature of the carobonate the easier is the decomposition.
Smaller size of Li+ ion has higher polarising power than Na+ ion due to small size and high positive charge density. The higher the positive charge density the easier is the destabilization of the carbonate ion.
Hence, decomposition of Li2CO3 is easier.
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