Sulfate of sodium is a type of inorganic sodium salt. When dissolved in water, the anhydrous form of sodium sulfate breaks down into sodium ions and sulfate ions. Because of its prominent role in extracellular fluid, sodium ion plays a significant role in the treatment of fluid and electrolyte imbalances. Sodium sulfate anhydrous is used to restore electrolyte balance and prevent the reabsorption or excretion of water and ions after delivery, making it a useful component of isosmotic solutions.