What makes salt water freeze slower?

Answer 1

A solid must have intermolecular forces between each molecule, so when salt is added to water, the salt gets in the way of the water molecules creating IM forces with each other, therefore lowering the freezing point.

Answer 2

Salt water does not freeze slower than fresh (or pure) water. It does freeze at a lower temperature than fresh water. This is due to the "freezing point depression" caused by dissolving a salt (of any type) in water. Salt lowers the temperature at which water freezes and melts.

Pure water freezes (and melts) at 0°C (32°F). Seawater, which has approximately 3500 parts per million (ppm) of various "salts" (including Na, Ca, Cl, SO4, Mg, K, and CO3), freezes and melts at -2.2°C. Even saltier water in salt lakes or the Dead Sea

(with about 300,000 ppm salt) may freeze and melt at temperatures as low as -20 to -30°C.

The technical explanation as to why this happens requires complex chemistry and physic. Simply put salt interferes with the joining of water molecules to make ice.

Answer 3

Salt water freezes slower than fresh water because the presence of dissolved salt lowers the freezing point of the water. This means that salt water needs to be colder than fresh water to freeze, as the salt ions disrupt the formation of ice crystals.

Answer 4

because since it has salt in it. it turns to a mixture then,those particles stay in water then when it freezes it leaves salt behind.

if wrong LOOK IN A ANSWER KEY OR IN YOUR BRAIN

Answer 5

water frezzes and turns into ice , salt melts ice which turns it back in to water so it makes it harder for it to freeze , duh . (:

Answer 6

Water with salt dissolved in it has to be colder than pure water in order to freeze.

That's why we throw salt on snow and ice on the street to melt them.

Answer 7

Sodium chloride has a positive heat ot of dissolution.