Metal 2+ ions:
Metal 2+ ions react with Na2CO3 to form insoluble metal carbonates, like this:
[M(H2O)6]^2+(aq) + CO3^2-(aq) <<<>>> MCO3(s) + 6H2O(l)
Metal 3+ ions:
Metal 3+ ions don't form M2(CO3)3 species when you react them with NaCO3.
They are stronger acids so they always form hydroxide precipitates instead.
The CO3^2- ions react with the H3O,+ ions, removing them from the solution and forming bubbles of CO2 gas.
[2M(H2O)6]^3+(aq) + 3CO3^2-(aq) <<<>>> [2M(H2O)3(OH)3](s) + 3CO2(g) + 3H2O(l)
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