Chemistry:Strontium nitrate

Strontium nitrate
	File:Sr(NO3)2.png
Names
	IUPAC name Strontium nitrate
Identifiers
CAS Number	10042-76-9 ;
3D model (JSmol)	Interactive image;
ChemSpider	23231 ;
EC Number	233-131-9;
PubChem CID	24848;
UNII	BDG873AQZL ;
	InChI InChI=1S/2NO3.Sr/c22-1(3)4;/q2-1;+2 Key: DHEQXMRUPNDRPG-UHFFFAOYSA-N ; InChI=1/2NO3.Sr/c22-1(3)4;/q2-1;+2 Key: DHEQXMRUPNDRPG-UHFFFAOYAG;
	SMILES [Sr+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O;
Properties
Chemical formula	Sr(NO; 3); 2
Molar mass	211.630 g/mol (anhydrous); 283.69 g/mol (tetrahydrate);
Appearance	white crystalline solid
Density	2.986 g/cm3 (anhydrous); 2.20 g/cm3 (tetrahydrate);
Melting point	570 °C (1,058 °F; 843 K) (anhydrous); 100 °C (212 °F; 373 K), decomposes (tetrahydrate);
Boiling point	645 °C (1,193 °F; 918 K) decomposes
Solubility in water	anhydrous: 660–709 g/L (20 °C (68 °F; 293 K)); ; tetrahydrate: 604.3 g/L (0 °C (32 °F; 273 K)); 2065 g/L (100 °C (212 °F; 373 K)); ;
Solubility in ammonia	soluble
Solubility in ethanol	slightly soluble
Solubility in acetone	slightly soluble
log P	0.19
Magnetic susceptibility (χ)	57.2×10−6 cm3/mol
Structure
Crystal structure	cubic (anhydrous); monoclinic (tetrahydrate);
Hazards
GHS pictograms
GHS Signal word	Danger
GHS hazard statements	H271, H318, H402
GHS precautionary statements	P210, P220, P221, P273, P280, P283, P305+351+338+310, P306+360, P370+378, P371+380+375, P501
NFPA 704 (fire diamond)	0 2 2 OX
Flash point	Non-flammable
	Lethal dose or concentration (LD, LC):
LD50 (median dose)	2750 mg/kg (rat, oral)
LC50 (median concentration)	>4.5 mg/L (rat, 4h, inhalation)
Related compounds
Other anions	Strontium carbonate; Strontium chloride; Strontium sulfate;
Other cations	Beryllium nitrate; Magnesium nitrate; Calcium nitrate; Barium nitrate;
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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	Infobox references

Strontium nitrate is an inorganic compound composed of the elements strontium, nitrogen and oxygen with the formula Sr(NO
3)
2. This colorless solid is used as a red colorant and oxidizer in pyrotechnics.

Preparation

Strontium nitrate is typically generated by the reaction of nitric acid with strontium carbonate.^[4]

2 HNO
3 + SrCO
3 → Sr(NO
3)
2 + H
2O + CO
2

Uses

Like many other strontium salts, strontium nitrate is used to produce a rich red flame in fireworks and road flares. Unlike most other commonly used color-producing compounds,^{[lower-alpha 1]} strontium nitrate (along with other strontium compounds) emit light in almost the same range from their hydroxides and oxides as their chlorides, with the chlorides emitting a slightly deeper red.^[6] Combined with strontium nitrate's high strength as an oxidizer, extremely pure colors in the orange-red to red color range are attainable with simple compositions using it as both oxidizer and colorant.^[7]^[8]

Strontium nitrate can aid in eliminating and lessening skin irritations. When mixed with glycolic acid, strontium nitrate reduces the sensation of skin irritation significantly better than using glycolic acid alone.^[9]

Biochemistry

As a divalent ion with an ionic radius similar to that of Ca²⁺ (1.13 and 0.99 Å respectively), Sr²⁺ ions mimic calcium's ability to traverse calcium-selective ion channels and trigger neurotransmitter release from nerve endings. It is thus used in electrophysiology experiments.