If you were to draw diagrams (such as that shown on the right) representing aqueous solutions of each of the following ionic compounds, how many anions would you show if the diagram contained six cations? (a) NiSO4, (b) Ca(NO3)2, (c) Na3PO4, (d) Al2(SO4)3

Answer 1

The anions will be SO4^=, NO3^-, PO4^3-. You don't have six cations; you have Ni^2+, Ca^2+, Na^+, Al^3+.
Perhaps you didn't type all of the problem.