I need help with this chemitry experiment { Ca2 (aq) S)42-(aq) ----> CaSO4(s)

Question

i need to know what to do in this experiment

Answer 1

Ca2+(aq) + SO4^2-(aq) ----> CaSO4(s)

This is a net ionic equation and it tells us that any time calcium ions come into contact with sulfate ions, some insoluble calcium sulfate is going to be produced.

In the actual reaction there were two "spectator ions", ions that came with the Ca2+ and sulfate ion, but which didn't react, but like these:

Ca(NO3)2(aq) + Na2SO4(aq) --> CaSO4(s) + 2NaNO3(aq)

A better way to represent it would be the ionic equation, where everything that is dissociated in water is shown as the individual ions:

Ca2+ + 2NO3- + 2Na+ + SO4^2- -->  CaSO4(s) + 2Na+ + 2 NO3-

Notice how the sodium and nitrate ions don't "do" anything?  Therefore, we refer to them as spectator ions since they aren't involved in the actual reaction.