This document discusses electrolyte replacement therapy and lists three common electrolyte compounds used: sodium chloride, potassium chloride, and calcium gluconate. Sodium chloride and potassium chloride are described in detail, including their molecular formulas, properties, preparation methods, assays, and uses. Calcium gluconate is also described briefly, noting its use as an electrolyte replenisher and to treat conditions caused by low calcium levels such as osteoporosis and rickets. The main purpose of electrolyte replacement therapy is to restore electrolyte and fluid balance in the body.