(08-09) F3 (08-09) F3 Chemistry Chemistry

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Ionic & Covalent Ionic & Covalent compoundscompounds

Colisa Tou (37)Colisa Tou (37)

F.3AF.3A

MagnesiumMagnesium ChlorideChloride

Formula: MgCl2Formula: MgCl2

Electron diagram:Electron diagram:

Physical Properties of MgCl2

Melting point & boiling point

Its melting point is 714 °C (on rapid heating). Its boiling point is 1412 °C.

physical state at

room temperatu

re

crystalline solid

colour white or colourless

density 2.32 g/cm³ (anhydrous)1.56 g/cm³ (hexahydrate)

solubility in water

54.3 g/100 ml (20 °C)

electrical conductivit

y

It does not conduct electricity in solid state/ their normal physical states but conduct electricity in aqueous state

Chemical properties of MgCl2laboratory preparatio

n

Magnesium chloride is regenerated from magnesium hydroxide using hydrochloric acid:Mg(OH)2(s) + 2 HCl

MgCl2(aq) + 2 H2O(l)It can also be prepared from magnesium carbonate by a similar reaction.

reactivity towards water / acid / alkali

It reacts with acids, water/moisture.

Uses of MgCl2Uses of MgCl2

- Use as an anti-icerUse as an anti-icer

Other use of Other use of MgCl2MgCl2

•Culinary use Culinary use

•Use in dust and erosion controlUse in dust and erosion control

•hydrogen storage hydrogen storage

Potential HazardPotential Hazard• Flammability: Non-flammableFlammability: Non-flammable

• irritantirritant

• May emit toxic fumes of May emit toxic fumes of

hydrogen chloride if involvedhydrogen chloride if involved

in a fire.in a fire.

special characteristicsspecial characteristics

• -slow heating leads to -slow heating leads to decomposition from 300 °C.decomposition from 300 °C.

• -magnesium chloride is -magnesium chloride is deliquescent. Handle and store in a deliquescent. Handle and store in a controlled environment and in an controlled environment and in an inert inert

gas such as argon. gas such as argon.

ResourcesResources• http://en.wikipedia.org/wiki/http://en.wikipedia.org/wiki/

Magnesium_chlorideMagnesium_chloride

• http://search.about.com/http://search.about.com/fullsearch.htm?fullsearch.htm?terms=chemistry terms=chemistry (http://forums.about.com/n/pfx(http://forums.about.com/n/pfx/forum.aspx?webtag=ab-/forum.aspx?webtag=ab-chemistry&nav=messages&mchemistry&nav=messages&msg=8234)sg=8234)

• http://http://www.espimetals.com/www.espimetals.com/msds's/Magnesiummsds's/Magnesium%20Chloride.htm%20Chloride.htm

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