Solubility details
Solubility formula:
NaCl + + Cl-
Solubility in water:
3.56g/L
State
State at 25C and 1000 kPa:
Solid
Melting point (Celsius):
801.00
o C
Melting point (Kelvin):
1074.00K
Boiling point (Celsius):
1413.00
o C
Boiling point (Kelvin):
1686.00K
General information
Appearence:
Colourless (however in nature it is usually impure and depending on the impurities is usually white or has a shade of blue)
Colour:
Colourless. However sodium chloride is usually impure and the color will depend on the amount and type of impurities. It can then be white, or blueish.
Sodium chloride is commonly known as table salt and is used raound the world as a spice and food preservative. It is found widely in nature, especially in ground waters. Sodium chloride is causing the salinity of seas and oceans.
Common reactions
Reaction of purification
Sodium chloride obtained from natural resources (eg. ocean, salt mine) is always impure. It can be purified by use of the common ion effect.
Sodium chloride has to be dissolved in minimal amount of water to obtain a saturated solution. The solution will consist of Na+ cations and Cl- anions. Then a HCl gas is passed through it. It also dissociates into anions and cations H+ and Cl- . Cl- is an ion common for both NaCl and HCl its amount in the solution is now highly increase what causes supression of NaCl dissociation (thisis known as the common ion effet). As a result sodium chloride exceeds its solubility product and is thrown down as a precipitate.
