(a) Give the formulae of the ions present in sodium phosphate.

Sodium phosphate is a compound made up of sodium ions (Na+) and phosphate ions (PO4 3-).

Here's the step-by-step breakdown:

1. Sodium phosphate is a salt of sodium and phosphate.

2. The sodium ion is a monovalent cation, which means it carries a single positive charge. Its formula is Na+.

3. The phosphate ion is a polyatomic anion, which means it is a single ion made up of more than one type of atom bonded together, and it carries a charge. It consists of one phosphorus atom and four oxygen atoms, and carries a 3- charge. Its formula is PO4 3-.

So, the ions present in sodium phosphate are Na+ and PO4 3-.