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Salinity

Salinity. Salt- ionic compound composed of a cation (+) and and anion (-) Ionic bond- atoms transfer electrons to form electrostatic attraction. Solutions Solution- molecules of one substance homogeneously dispersed among molecules of another substance

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Salinity

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  1. Salinity • Salt- ionic compound composed of a cation (+) and and anion (-) • Ionic bond- atoms transfer electrons to form electrostatic attraction

  2. Solutions • Solution- molecules of one substance homogeneously dispersed among molecules of another substance • Solvent- more abundant substance (does the dissolving) • Solute- substance being dissolved • Dissociation- when salt dissolves its ions are pulled apart by water molecules • http://www.wou.edu/las/physci/ch412/dis_nacl.mov

  3. Salinity- total concentration of dissolved salts (expressed in parts per thousand (ppt, %o) • Salt cycle- how salt is added or removed from ocean • Added by runoff, erosion of coastal rock, and hydrothermal vents • Removed by certain biological and chemical factors • The ocean is in chemical equilibrium because these processes balance out so the average salinity does not change

  4. Ocean’s salinity varies very little from 35 ppt • Brackish- freshwater mixes with saltwater (0.6- 30 ppt)

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