about what is the average concentration of salts in earth's oceans?
The ocean has a lot of salt in it, 3.5% by weight, but that is not just dissolved sodium chloride (Na+, Cl-). The dissolved sodium and chlorine atoms account for about 85% of the salt by weight. The ocean contains calcium, magnesium, sodium and potassium with bicarbonate, sulfate, chlorine and bromine. (If you remove the water, then what is left is, by weight, Clâ 55%, Na+ 30.6%, SO2â, 4 7.7%, Mg2+ 3.7%, Ca2+ 1.2%, K+ 1.1%, Other 0.7%)