Solubility of Group 2 hydroxides and carbonates
Why does the solubility of group 2 hydroxides increase as you go down the group but the solubility of group 2 carbonates decrease as you go down the group?
As a general rule, greater the difference in size between the anion and cation, greater is the solubility.
Because of the small size of the hydroxide ion, the size difference between the ions increases down the group as the size of the cation increases. But the carbonate ion is large, and the size difference decreases down the group, leading to a decrease in solubility.
Because of the small size of the hydroxide ion, the size difference between the ions increases down the group as the size of the cation increases. But the carbonate ion is large, and the size difference decreases down the group, leading to a decrease in solubility.
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