Salt Questions · Science, chemistry & environment
Why does salt dissolve faster in hot water than cold water?
Short answer
In hot water, water molecules move faster and collide with the salt crystal more often and with more energy, pulling ions away more quickly. But salt's solubility barely changes with temperature: about 36 g dissolves in 100 g of water at room temperature, and only about 39 g near boiling. Hot water dissolves salt faster, not much more of it.
Grams of salt that dissolve in 100 g of water
Approximate values; solubility barely changes with temperature.
Rate vs amount
- Rate: how quickly salt dissolves. Heat, stirring and smaller crystals all speed it up.
- Solubility: the maximum that can dissolve. For sodium chloride, it is almost flat with temperature.
Salt is unusual
Sugar's solubility more than doubles between cold and boiling water, which is how syrups and rock candy are made. Salt's barely changes, because dissolving it takes in only a little heat. That's why you can't make a much stronger brine just by heating it.
Practical tip
For brines and pickles, dissolve salt in a little warm water, then add cold water to cool it before it touches food.
Related on The Salt Almanac
More science, chemistry & environment questions
- What is rock salt made of?
- How does salt water affect the density of water?
- Why do things float easier in the Dead Sea?
- What is the difference between organic and inorganic salt in chemistry?
- What is the chemical formula for table salt?
- Why does salt melt ice on roads in the winter?
Cite this page
For school projects and reports. Teachers often prefer the original sources too: see the list below.
The Salt Almanac. (2026, November 8). Why does salt dissolve faster in hot water than cold water. https://saltalmanac.com/answers/why-does-salt-dissolve-faster-in-hot-water-than-cold-water
“Why does salt dissolve faster in hot water than cold water.” The Salt Almanac, 8 Nov. 2026, saltalmanac.com/answers/why-does-salt-dissolve-faster-in-hot-water-than-cold-water. Accessed [today's date].
“Why does salt dissolve faster in hot water than cold water.” The Salt Almanac. Last modified November 8, 2026. https://saltalmanac.com/answers/why-does-salt-dissolve-faster-in-hot-water-than-cold-water.
Original sources
- Wikipedia. Sodium chloride (data page). https://en.wikipedia.org/wiki/Sodium_chloride_(data_page)
- Wikipedia. Solubility. https://en.wikipedia.org/wiki/Solubility