Strontium nitrate

Structural formula
General
Surname	Strontium nitrate
other names	Nitric acid strontium
Molecular formula	Sr (NO 3 ) 2
Brief description	colorless crystals that decompose in the heat
External identifiers / databases
CAS number 10042-76-9 EC number 233-131-9 ECHA InfoCard 100.030.107 PubChem 24848 Wikidata Q421083
properties
Molar mass	211.63 g mol −1
Physical state	firmly
density	2.986 g cm −3
Melting point	570 ° C
boiling point	decomposition
solubility	good in water (660 g l −1 at 20 ° C)
safety instructions
GHS labeling of hazardous substances danger H and P phrases H: 271-318 P: 210-220-280-305 + 351 + 338-306 + 360-371 + 380 + 375
Toxicological data	1028 mg kg −1 ( LD 50 ,  mouse ,  oral ) 2750 mg kg −1 ( LD 50 ,  rat ,  oral )
Thermodynamic properties
ΔH f 0	−978.2 kJ / mol
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Strontium nitrate , Sr (NO ₃ ) ₂ , is the strontium salt of nitric acid . It is used as an oxidizing agent in pyrotechnics and gives it the deep red flame color typical of strontium.

Manufacturing

Strontium nitrate is made by dissolving strontium carbonate in nitric acid.

${\displaystyle \mathrm {SrCO_{3}+2\ HNO_{3}\rightarrow \ Sr(NO_{3})_{2}+H_{2}O+CO_{2}\uparrow } }$

properties

The anhydrous strontium nitrate crystallizes above 31.3 ° C., the tetrahydrate below this temperature from aqueous solution. Anhydrous strontium nitrate crystallizes in the cubic crystal system in the space group Pa 3 (space group no. 205) with the lattice parameter a = 778.13  pm . In the unit cell contains four formula units . The crystals are isotypic to barium nitrate . The tetrahydrate forms monoclinic crystals with the space group C 2 / c (No. 15) , the lattice parameters a = 1112 pm, b = 1417 pm, c = 634 pm, β = 123.75 ° and four formula units in the unit cell.

use

Strontium nitrate is u. a. used in pyrotechnics. Together with magnesium powder , at high temperature, favored by z. B. 5-amino-1 H -tetrazole or hexamethylenetetramine , briefly strontium (I) hydroxide (SrOH) is generated. This is a strong emitter in the red spectral range and acts as the sole color transmitter in bright and deeply saturated red pyrotechnic light packs .

Individual evidence

1. ↑ Entry on strontium nitrate. In: Römpp Online . Georg Thieme Verlag, accessed on December 5, 2013.
2. ↑ ^{a b c d e f g} Entry on strontium nitrate in the GESTIS substance database of the IFA , accessed on May 10, 2017(JavaScript required) .
3. ↑ Strontium nitrate data sheet from Sigma-Aldrich , accessed on May 14, 2017 ( PDF ).
4. ↑ David R. Lide (Ed.): CRC Handbook of Chemistry and Physics . 90th edition. (Internet version: 2010), CRC Press / Taylor and Francis, Boca Raton, FL, Standard Thermodynamic Properties of Chemical Substances, pp. 5-16.
5. ↑ JP MacMillan, JW Park, R. Gerstenberg, H. Wagner, K. Köhler, P. Wallbrecht: Strontium and Strontium Compounds in Ullmanns Encyclopedia of Industrial Chemistry, 2012 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim, doi : 10.1002 /14356007.a25_321 .
6. ^ Gmelin's Handbook of Inorganic Chemistry: Strontium, System Number 29, Eighth Edition, Verlag Chemie GmbH, Berlin 1931, page 96.
7. ↑ H. Nowotny, G. Heger: Structure refinement of strontium nitrate, Sr (NO ₃ ) ₂ , and barium nitrate, Ba (NO ₃ ) ₂ in Acta Cryst. 1983 , C39 , pp. 952-956 doi : 10.1107 / S0108270183006976
8. ↑ B. Ribár, B. Matković and M. šljukić: The crystal structure of strontium nitrate tetrahydrate, Sr (NO ₃ ) ₂  · 4 H ₂ O in Zeitschrift für Kristallographie 1972 , 135 , pp 137-144. doi : 10.1524 / zkri.1972.135.1-2.137
9. ↑ Jesse J. Sabatini, Ernst-Christian Koch, Jay C. Poret, Jared D. Moretti, Seth M. Harbol: Red pyrotechnic flares - without chlorine! In: Angewandte Chemie . 127, 2015, pp. 11118–11120, doi : 10.1002 / anie.201505829 .