does pure water freezes faster than salt water and why?

Answer 1

salinity changes the chemical composition of water, effecting its boiling and freezing points.

Answer 2

This is a phenomenon known as freezing point depression. The salt ions dissolved in the water are nestled in between the water molecules. When the temperature is lowered and the water molecules slow down and come together, the ions get in the way, and the water molecules do not get close enough together to become what we know as solid at the normal 0 degrees Celcius - the temperature must be brought even lower.

There is also what is called boiling point elevation - water will boil at a higher temperature when salt is dissolved in it. This is because those same ions dissolved in the water are holding on to the water molecules. When we raise the temperature it takes more energy for the water molecules to break both the intermolecular bonds with other water molecules AND the attration of the water molecules for the ions.

Answer 3

yes, pure water does freeze faster than salt water. pure water freezes at 32 degrees farenheit, 0 degrees celcius. saltwater freezes at 28 degrees farenheit (-2.22 degrees C). the reason being is because the salt in the salt water actually lowers the freezing point of water. the same reason why they put salt out on the roads to keep them from icing up in the winter

Answer 4

yes, pure water freezes fater then salt water because the salt present in the water lowers its temperature thus giving it a lower freezing point or in other words lowers the temperature at which it freezes,therefore salt waterfreezes later than pure water or pure water freezes faster than salt water.

Answer 5

salt water freezes mor quickly than pure water because salt increases the freezing point of water.for example if pure water freezes at 4 degree celcius then salte water freezes at a temperature above 4 degrees.

Answer 6

Many of the answers are correct about why the freezing point drops. However they all missed one little tidbit: 100% pure water will not freeze. There has to be some (although slight) impurities for the crystalline structure to form around.

Answer 7

Pure water freeezes quicker. Because Salt water resist freezing becasue salt melts ice.

Answer 8

Dissolved salt interferes with the lattice structure that water would otherwise form as it freezes. Therefore, colder temperatures are required to freeze salt water.

Answer 9

The sodium and chloride ions that make up salt cause the individual water molecules to be held just a bit further apart from one anothert than in pure water. A colder temperature is ncecessary to overcome that extra bit of distance.

Answer 10

the density of pure water is less than salt water. the more dense a substance the lower the temp. needed to freeze it..

Answer 11

hi,
note what i am writing
pure water has exact melting,freezing and boiling point but any impurity such as salt in ur question will low melting and freezing point of water and will raise its boiling point.so that why pure water will freezes later than salt water