How much sodium is dissolved in seawater?

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The concentration of sodium in seawater is approximately 10.679 grams per kilogram of seawater, based on a salinity of 34.7.1

Sodium is one of the six most abundant ions in the ocean, and together with chloride, it forms sodium chloride, which is the predominant compound in sea salt. While the total salt content—measured as salinity—can vary due to local evaporation and precipitation, the relative proportions of these major constituents remain remarkably constant throughout the open ocean.231