as you go down the group, Carbonates become less soluble (ie more precipitate form for CaCO3 than for MgCO3); Hydroxides become more soluble Sodium salts and Chlorides salts are always soluble two solutions are reacting to make an insoluble precipitate: CaCl2(aq) + Na2CO3(aq) = CaCO3(s) +2 NaCl(aq)
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