Science, Tech, Math › Science What Is the Most Abundant Salt in the Ocean? Share Flipboard Email Print Young girl in the Dead Sea holding sea salt, En Bokek, Israel. Getty Images/Elan Fleisher/LOOK-foto Science Chemistry Basics Chemical Laws Molecules Periodic Table Projects & Experiments Scientific Method Biochemistry Physical Chemistry Medical Chemistry Chemistry In Everyday Life Famous Chemists Activities for Kids Abbreviations & Acronyms Biology Physics Geology Astronomy Weather & Climate by Anne Marie Helmenstine, Ph.D. Dr. Helmenstine holds a Ph.D. in biomedical sciences and is a science writer, educator, and consultant. She has taught science courses at the high school, college, and graduate levels. Updated May 23, 2019 There are several salts in seawater, but the most abundant is ordinary table salt or sodium chloride (NaCl). Sodium chloride, like other salts, dissolves in water into its ions, so this is really a question about which ions are present in the greatest concentration. Sodium chloride dissociates into Na+ and Cl- ions. The total amount of all types of salt in the sea averages about 35 parts per thousand (each liter of seawater contains about 35 grams of salt). Sodium and chloride ions are present at much higher levels than components of any other salt. Chemical Concentration (mol/kg) H2O 53.6 Cl- 0.546 Na+ 0.469 Mg2+ 0.0528 SO42- 0.0282 Ca2+ 0.0103 K+ 0.0102 C (inorganic) 0.00206 Br- 0.000844 B 0.000416 Sr2+ 0.000091 F- 0.000068 Molar Composition of Seawater Reference: DOE (1994). In A.G. Dickson & C. Goyet. Handbook of methods for the analysis of the various parameters of the carbon dioxide system in sea water. 2. ORNL/CDIAC-74. Continue Reading Why the Sea Is Salty (Yet Most Lakes Are Not) Here's Why Salt Melts Ice Salinity: Definition and Importance to Marine Life What Is Freezing Point Depression and How Does It Work? How Salty Is the Water in the Ocean? Know the Table Salt Formula Is Dissolving Salt in Water a Chemical Change or Physical Change? Here's How Salt Melts Ice How Salt Melts Ice and Snow Do You Know How to Identify a Hypertonic Solution? The Simple Science of Why Salt Increases Water's Boiling Point This Common Kitchen Staple Is a Perfect Example of an Ionic Compound Common Chemicals and Where to Find Them Facts and Information About Marine Life What Is Road Salt and How Does It Work? What Is the Common-Ion Effect?