Strontium chlorate

Strontium chlorate is a chemical compound with the formula Sr(ClO₃)₂. It is a strong oxidizing agent. It exists in several hydrated forms; the monohydrate (Sr(ClO₃)₂·H₂O), the trihydrate (Sr(ClO₃)₂·3H₂O), and the octahydrate (Sr(ClO₃)₂·8H₂O)^[1]

Strontium chlorate

Identifiers
CAS Number	7791-10-8 Y
3D model (JSmol)	Interactive image
ChemSpider	23043
ECHA InfoCard	100.029.309
EC Number	232-239-3
PubChem CID	24641
UNII	XG48A4P4FB Y
CompTox Dashboard (EPA)	DTXSID70890637
InChI InChI=1S/2ClHO3.Sr/c2*2-1(3)4;/h2*(H,2,3,4);/q;;+2/p-2 Key: FRTABACCYANHFP-UHFFFAOYSA-L
SMILES [O-]Cl(=O)=O.[O-]Cl(=O)=O.[Sr+2]
Properties
Chemical formula	Sr(ClO3)2
Molar mass	254.51 g·mol−1
Appearance	colorless or white crystals
Density	3.15 g/cm3
Melting point	120 °C (248 °F; 393 K) (hydrates, decompose to anhydrous) 290 °C (554 °F; 563 K) (anhydrous, decomposes) [1]
Solubility in water	174.9 g/100 mL (18 °C (64 °F; 291 K))
Solubility in ethanol	soluble (in dilute), insoluble (in absolute)
Magnetic susceptibility (χ)	73.0×10−6 cm3/mol
Refractive index (nD)	1.516, 1.605, & 1.626
Structure
Crystal structure	rhombic
Hazards[2]
GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H271, H302, H312, H315, H320, H332, H335, H411
Precautionary statements	P210, P220, P221, P261, P273, P280, P301+P312, P302+P352, P304+P340, P305+P351+P338, P332+P313
NFPA 704 (fire diamond)	2 0 2 OX
Related compounds
Other anions	Strontium chromate Strontium nitrate Strontium perchlorate Strontium peroxide
Other cations	Potassium chlorate Magnesium chlorate Barium chlorate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

It has been used as an oxidizing agent in explosive mixtures, where it has a cooling effect because of the large amount of water of crystallization. It has also been used in a published Italian pyrotechnic violet star formula.^[1]

Preparation

Strontium chlorate may be prepared by neutralizing an aqueous chloric acid (HClO₃) solution with Sr(OH)₂ or strontium carbonate (SrCO₃) and then warming this solution over concentrated sulfuric acid (H₂SO₄). The anhydrous salt may be prepared by heating any of the hydrates to 120 °C (248 °F).^[1]

It may also be prepared by warming a solution of strontium hydroxide and bubbling chlorine through it, with subsequent crystallization. Chlorine has no action on dry Sr(OH)₂, but it converts the hydrate (Sr(OH)₂·8H₂O) into strontium chloride (SrCl₂) and chlorate, with a small quantity of strontium hypochlorite also being produced.^[3]