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The solubilities of carbonates decrease down the magnesium group due to a decrease in
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hydration energies of cations
hydration energies of cations
The solubility is governed by $\Delta \mathrm{H}_{\text {solution }}$ i.e. $\Delta \mathrm{H}_{\text {solution }}=\Delta \mathrm{H}_{\text {lattice }}-\Delta \mathrm{H}_{\text {Hydration }}$.
Due to increase in size the magnitude of hydration energy decresaes and hence the solubility.
Due to increase in size the magnitude of hydration energy decresaes and hence the solubility.
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