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'''Strontium chloride''' (SrCl<sub>2</sub>) is a ] of ] and ]. It is ionic and water-soluble. It is less toxic than ], though more toxic than ]. It emits a bright red colour when heated in a flame. '''Strontium chloride''' (SrCl<sub>2</sub>) is a ] of ] and ]. It is ionic and water-soluble. It is less toxic than ], though more toxic than ]. Like all compounds of Sr, this salt emits a bright red colour in a flame and in fact is used as a source of redness in fireworks. Otherwise strontium chloride is a typical ], forming ] aqueous solutions.


⚫ == Preparation==
== Chemical properties ==
Strontium chloride is a typical ]ic metal ], and it can be used as a source of other strontium compounds such as strontium chromate:

SrCl<sub>2</sub>(]) + ](]) → SrCrO<sub>4</sub>(]) + 2 ](])

SrCl<sub>2</sub> always acts as a simple ], and it is completely neutral in solution.

⚫ == Preparation ==
Strontium chloride can be prepared from ] or ] reacting with ]: Strontium chloride can be prepared from ] or ] reacting with ]:
⚫ :](]) + 2 ](]) → SrCl<sub>2</sub>(]) + 2 H<sub>2</sub>O

From aqueous solution, one obtains the ], SrCl<sub>2</sub>·6H<sub>2</sub>O. Dehydration occurs in stages, commencing above 61 °C. Full dehydration occurs at 320 °C.<ref name=Ullmann>J. Paul MacMillan, Jai Won Park, Rolf Gerstenberg, Heinz Wagner, Karl Köhler, Peter Wallbrecht"Strontium and Strontium Compounds" in Ullmann's Encyclopedia of Industrial Chemistry, 2005 Wiley-VCH: Weinheim. DOI 10.1002/14356007.a25 321</ref>
⚫ ](]) + 2 ](]) → SrCl<sub>2</sub>(]) + 2 ](])

It can also be prepared by the union of the elements, ] and ].

== Uses == == Uses ==
There are no major uses for strontium chloride, though it can be used to prepare less common compounds of strontium, and may be useful in reducing gum sensitivity, and is known as Elecol for this purpose. Certain toothpastes such as Sensodyne are called "strontium chloride toothpastes," although most now use potassium nitrate instead (with the exception of Sensodyne original). Like barium chloride it can be used to test for ] ion, though not at such low concentration, since ] is more soluble than ]. No major uses exist for strontium chloride. It is the precursor to other compounds of strontium, such as and it can be used as a source of other strontium compounds such as yellow strontium chromate, which is used as a corrosion inhibitor for aluminium. The precipitation proceeds analogously to the related sulfate:
<ref name=Ullmann/>

SrCl<sub>2</sub>(]) + ](]) → SrSO<sub>4</sub>(]) + 2 ](]) :SrCl<sub>2</sub> + Na<sub>2</sub>CrO<sub>4</sub> → SrCrO<sub>4</sub> + 2 ]
Strontium chloride is occasionally used as a flame colouring agent (red) in ], and in small quantities in ] making and ]. The ] ] strontium-89 is usually administered in the form of strontium chloride: it is used for the treatment of ]. Sea water aquaria require small amounts of strontium chloride, which is consumed in the production of the ]s of certain ].

Strontium chloride is occasionally used as a flame colouring agent (red) in ], and in small quantities in ] making and ]. It is added to some toothpastes to reduce ].

The ] ] strontium-89 is usually administered in the form of strontium chloride: it is used for the treatment of ].

Sea water aquaria must add small amounts of strontium chloride to the water, as it is consumed in the production of the ]s of certain ].


== Precautions == ===Dental care===
SrCl<sub>2</sub> is useful in reducing gum sensitivity and ]. Known in the US as Elecol and Sensodyne, these products are called "strontium chloride toothpastes," although most now use potassium nitrate instead (with the exception of "Sensodyne original").
Although much less toxic than barium chloride, strontium chloride should still be handled with care.


==References==
<references/>
==External links== ==External links==


Revision as of 01:09, 20 January 2008

Strontium chloride hexahydrate.jpg
Strontium chloride hexahydrate
IUPAC name
Strontium chloride
General
Molecular formula SrCl2
Molar mass 158.53 g/mol (anhydrous)

266.62 g/mol (hexahydrate)

Appearance White crystalline solid
CAS number (hexahydrate)

(anhydrous)

MSDS Strontium chloride MSDS
Other names
  • Strontium(II) chloride
Bulk properties
Density 3.052 g/cm³ (anhydrous, monoclinic form)

1.672 g/cm³ (dihydrate) 1.930 g/cm³ (hexahydrate)

Solubility water: 53.8 g/100 cm³ (20 °C)

ethanol: very slightly soluble acetone: very slightly soluble

Melting point 874 °C (1147 K)
Boiling point 1250 °C (1520 K)
Hazards: Irritant
Structure
Coordination geometry octahedral (six-coordinate)
Crystal structure Deformed TiO2
Hydrates dihydrate (rare)

hexahydrate

Related compounds
strontium fluoride

strontium bromide strontium iodide

calcium chloride

barium chloride

Strontium chloride (SrCl2) is a salt of strontium and chlorine. It is ionic and water-soluble. It is less toxic than barium chloride, though more toxic than calcium chloride. Like all compounds of Sr, this salt emits a bright red colour in a flame and in fact is used as a source of redness in fireworks. Otherwise strontium chloride is a typical salt, forming neutral aqueous solutions.

Preparation

Strontium chloride can be prepared from strontium hydroxide or strontium carbonate reacting with hydrochloric acid:

Sr(OH)2(aq) + 2 HCl(aq) → SrCl2(aq) + 2 H2O

From aqueous solution, one obtains the hexahydrate, SrCl2·6H2O. Dehydration occurs in stages, commencing above 61 °C. Full dehydration occurs at 320 °C.

Uses

No major uses exist for strontium chloride. It is the precursor to other compounds of strontium, such as and it can be used as a source of other strontium compounds such as yellow strontium chromate, which is used as a corrosion inhibitor for aluminium. The precipitation proceeds analogously to the related sulfate:

SrCl2 + Na2CrO4 → SrCrO4 + 2 NaCl

Strontium chloride is occasionally used as a flame colouring agent (red) in pyrotechnics, and in small quantities in glass making and metallurgy. The radioactive isotope strontium-89 is usually administered in the form of strontium chloride: it is used for the treatment of bone cancer. Sea water aquaria require small amounts of strontium chloride, which is consumed in the production of the exoskeletons of certain plankton.

Dental care

SrCl2 is useful in reducing gum sensitivity and periodontal disease. Known in the US as Elecol and Sensodyne, these products are called "strontium chloride toothpastes," although most now use potassium nitrate instead (with the exception of "Sensodyne original").

References

  1. ^ J. Paul MacMillan, Jai Won Park, Rolf Gerstenberg, Heinz Wagner, Karl Köhler, Peter Wallbrecht"Strontium and Strontium Compounds" in Ullmann's Encyclopedia of Industrial Chemistry, 2005 Wiley-VCH: Weinheim. DOI 10.1002/14356007.a25 321

External links

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