Salt water freezes at a lower temperature than pure fresh water. While pure water freezes at 0°C (32°F), typical ocean water with about 3.5% salt freezes at around -1.8°C (28.4°F). The absolute lowest freezing point for heavily salted water is -21.1°C (-5.98°F)
https://www.quora.com/What-is-the-freezing-point-of-a-salt-water-solution
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At room temperature, water reaches a maximum sodium chloride concentration of about 357 to 360 grams per liter (roughly 26.3% by weight). This limit exists because water molecules have a finite capacity to surround and hold separate sodium and chloride ions.
https://www.quora.com/Why-is-NaCl-soluble
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