what temperature does sea water freeze?

Answer 1

The freezing point of seawater depends upon it's salinity,
which is the amount of salt that it contains. Open ocean seawater
has a salinity of about 35 (no units are used for salinity
anymore, although you may see it called o/oo which means
parts per thousand or psu, which means practical salinity units.
Neither usage is now considered correct). Anyway, fresh
water freezes at 0 degrees Celsius and 35 water freezes
at about -2 degrees C. The decrease is linear so that water
with a salinity of 17 freezes at about -1 degree C.
Stacie

Answer 2

Depends on how much salt is in the sea. Normal water freezes at 32 degrees F. The higher the concentration of salt, the lower the temperature it takes to freeze it.

Answer 3

Beren gave a good answer. If you take a sample of water at 25 C and measure the reorientation time with magnetic resonance, you will find evidence for short lived ice crystals. Try measuring the pair correlation function with x-ray diffraction and you will find a small O-O feature corresponding to the lattice constant for hexagonal ice crystals. With neutron scattering, you will find evidence of H-bonding (and a lot of incoherent scattering unless you use D2O). Measure the infrared spectrum of water at 25 C at high resolution and then do a Fourier deconvolution of the peaks near 3500 cm-1 and you will find features (in order of decreasing frequency) monomer, dimer, trimer, ..etc. Conversely, if the same measurements are made at -25 C, there is evidence for disordered "free" H2O molecules. Freezing is a construct of 19th century science and does not adequately describe the complexity of the underlying molecular physics. Freezing loosely describes the fraction of bound ordered molecules. Ice has a lot more bound molecules than water. It is actually quite difficult to arrive at a scientifically rigorous definition of freezing (the required fraction of bound molecules) based on statistical mechanics. In the presence of a salt or other solute, there is a cage of structural water around the solute molecule or ion. The cage has local order and is in a sense ice, but the structure is incommensurate with long range ordering. This is macroscopically manifest as a depression of freezing point.

Answer 4

Water freezes at 32°F (0°C). Adding salt to water lowers the freezing point. How low the freezing point goes depends upon the amount of salt in water.
The lowest freezing point for a salt solution is -6.0°F (-21.1°

Baltic Sea -0.3C 31.3F
Black Sea -1.0C 30.2F
The Oceans -2.0C 28.5
Red Sea -2.6C 27.9F
Great Salt Lake -11.2C 11.8F
Dead Sea -21.1C -6.0F

Answer 5

It will depend on the concentration of salt and other impurities in the sample of sea water. The chemical activites of these will lower the freezing point. The freezing point will propably be about -10 degrees celsius or so but it all depends on the chemical activities which depend on the concentraion of the ions in the water.

Answer 6

The freezing point of sea water is determined by its salinity. The lowering of the freezing point is proportional to the salinity. Normal salinity seawater freezes at about -2C.

Answer 7

a little bit below 0 degrees Celcius

Answer 8

-1 degree celecius