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Physical Properties

• Molecular formula is C₇H₅NaO₂.

• Molecular Weight is 144.11 g mol^-1.

• Density is 1.44 g cm^-3.

• Melting point is greater than 573 K (300^oC).

Taken from: http://www.cartooncottage.com/html/misc3.html

• Flash point is greater than 373 K (100^oC).

• Auto-ignition temperature is greater than 773 K (500^oC).

• White Powder or crystals.

Taken from: http://www.naturesflavors.com/default.php?cPath=2

• Weak organic acid because of the carboxyl group.

• Hygroscopic.

• It is soluble in water because it dissociates to form benzoic and sodium ions.

• Solubility in water at 293K (20^oC) is 63 g/100ml.

• Dissolved in water it is a transparent colourless solution.

• In addition to being soluble in water  it is also soluble in ether, chloroform  and fixed oils.

• If a substance is hygroscopic it  means that it readily absorbs water from its surroundings.
• The flash point is the lowest temperature that a liquid can form a mixture in air close to the surface of the liquid which is ignitable. The lower the flash point, the easier it is to set fire to the material.
• The auto-ignition temperature is the lowest temperature at which a substance will spontaneously ignite without the use of a spark to aid it.
• A carboxyl group is one in which a carbon atom is covalently bonded to two oxygen atoms. One of the oxygen's is double bonded to the carbon, and the other is also attached to a hydrogen atom.