Concentration of Ions

[chemkink]

I need to know how to calculate the concentration of all of the ions in these solutions:

0.00200 mol of sodium phosphate in 10.0 mL of solution
0.300 mol of barium nitrate in 600.0 mL of solution
1.00 g of potassium chloride in 0.500 L of solution
132 g og ammonium sulfate in 1.50 L of solution

I have know idea how to do this and it isn't in my book, so I obviously need help.

Chemkink