Na and Cl: Most Common Ions in Ocean Water

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Sodium (Na) and chloride (Cl) are the most common ions in ocean water due to their abundance in nature and stability. The ocean's salinity remains relatively constant because the processes of river runoff, precipitation, evaporation, and mineral erosion balance each other out. These ions are favored in seawater because they are stable and soluble. The discussion highlights the natural occurrence and stability of Na and Cl as key factors in their prevalence. Overall, the dynamics of ocean chemistry contribute to the consistent salinity levels observed.
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Homework Statement


Why are Na and Cl the two most common ions?

Why doesn't the ocean's salinity change

The Attempt at a Solution



I would guess that they're the most abundant ions simply because there occur more often in nature than the other elements in sea water.

As for the second part, I'd guess that rivers, precipitation along with evaporation, and minerals being eroded into the ocean tend to cancel one another out.
 
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Most likely because they are most stable ions. Not all ions are stable just because they have octet. Don't take my answer to seriously xD

2nd part: no idea
 

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