What is the primary chemical composition of seawater?

The primary chemical composition of seawater is indeed over 95 percent water. Seawater is a complex mixture, with its main component being water, which constitutes about 96.5 percent of its total composition. The remaining percentage is made up of various dissolved salts, organic matter, and gases. This high concentration of water is crucial for the various chemical and biological processes that occur in marine environments.

Understanding the significance of water in seawater is fundamental, as it plays a vital role in regulating temperature, supporting marine life, and influencing ocean currents and weather patterns. The presence of dissolved salts, primarily sodium chloride, contributes to seawater's unique properties but does not change the fact that water remains its predominant component.