What is in Seawater?

Seawater is mostly water, but with a lot of dissolved salts, or ions. Salinity in the ocean mainly comes from sodium and chloride ions. But that is not all! Below is a table of the major ions that make up seawater, these ions account for 99.8% in seawater.

Table-1

Symbol	Name	% of Ions	mMole	g/L
Cl-	Chloride	55.29	546	19.353
Na+	Sodium	30.74	469	10.76
Mg2+	Magnesium	3.69	53	1.292
So4 -2	Sulphate	7.75	28	2.712
Ca2+	Calcium	1.18	10.3	0.412
K+	Potassium	1.14	10.2	0.399
	Total percent	99.8

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