Which solution will form a precipitate when mixed with a solution of aqueous na2co3?

When mixed with a solution of aqueous sodium carbonate, a solution containing copper (II) ions will form a precipitate.

Explanation:

A precipitation reaction is a reaction in which one of the products is insoluble in the solvent of the reaction (this is usually water).

These reactions are one of the types of double-displacement reactions in which the cations and anions of the reactants are inter-changed.

When mixed with a solution of aqueous sodium carbonate, a solution containing copper (II) ions will form a precipitate which is insoluble in water.

The copper (II) ions will form together with the carbonate, a precipitate. Which will be insoluble. An example is CuSO4.

Na2CO3 + CuSO4 →   2Na+ + CO32- +  Cu+  +  SO42- →2Na+ + SO42- + CUCO3

where's the diagram?

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.