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Between 50% and 20%, gypsum precipitates out (Ca SO4.2H2O), which also tastes like chalk.
This page details the chemical composition of sea water, salinity, density, its dissolved gases, carbon dioxide and p H as limiting factor.
The density of 35ppt saline seawater at 15ºC is about 1.0255, or s (sigma)= 25.5. The relationship between temperature, salinity and density is shown by the blue isopycnal (of same density) curves in this diagram.
In red, green and blue the waters of the major oceans of the planet is shown for depths below -200 metre.
The Red Sea located in the desert region but almost completely closed, shows the highest salinity of all (40ppt) but the Mediterranean Sea follows as a close second (38ppt).
Lowest salinity is found in the upper reaches of the Baltic Sea (0.5%).