I write down the formulas: zinc sulfate, calcium phosphate, potassium chloride

I write down the formulas: zinc sulfate, calcium phosphate, potassium chloride, copper citrate (2). Put the valence over the metal atoms and acid residues in the salt formulas

1) Zinc sulfate. H2SO4 is sulfate acid, and its remainder SO4 is sulfate.
ZnSO4
Zn is monovalent, S is tetravalent, O is divalent.
2) Calcium phosphate. H3PO4 is phosphate acid, and its remainder PO4 is phosphate.
Ca2 (PO4) 2
Ca – bivalent, P – pentavalent, O – bivalent.
3) Potassium chloride. HCl – perchloric or chloride acid, its remainder Cl – chloride.
KCl
K is monovalent, Cl is monovalent.
4) Copper citrate (2). C3H5O (COOH) 3 is citric acid, and its remainder C6H5O7 is citrate.
Cu3 (C6H5O7) 2
Cu is divalent, C is tetravalent, H is monovalent, O is divalent.