The amount of sodium chloride and other salts dissolved in a water sample is called its salinity.

Salinity is typically measured in parts per thousand (ppt) or grams per kilogram (g/kg). It represents the total amount of dissolved salts in a given mass of water.

Here's a breakdown:

* Sodium chloride (NaCl) is the most abundant salt in seawater, but other salts like magnesium chloride (MgCl2), potassium chloride (KCl), and calcium sulfate (CaSO4) are also present.

* Salinity is a crucial factor in determining the physical and chemical properties of water, including its density, freezing point, and the types of organisms that can survive in it.

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