Sodium Phosphate, or phosphate de sodium (Na3PO4), is the combination of phosphoric acid (H3PO4) with sodium (Na). This ingredient has emulsifying and regulating properties. Sodium phosphate and sodium biphosphate are sources of phosphorus. When combined, they help cleanse the intestines and alleviate constipation. The question that arises is: what is the utility of sodium phosphate? Stay focused.