Strontium carbonate

Structural formula
General
Surname	Strontium carbonate
other names	Carbonic strontium Strontianite Strontium carbonicum
Molecular formula	SrCO 3
Brief description	white solid
External identifiers / databases
CAS number 1633-05-2 EC number 216-643-7 ECHA InfoCard 100.015.131 PubChem 15407 Wikidata Q413629
properties
Molar mass	147.63 g mol −1
Physical state	firmly
density	3.5 g cm −3
Melting point	1497 ° C (6 M Pa )
boiling point	Decomposition from 1200 ° C
solubility	very bad in water (0.01 g l −1 at 18 ° C)
safety instructions
GHS labeling of hazardous substances no GHS pictograms H and P phrases H: no H-phrases P: no P-phrases
Thermodynamic properties
ΔH f 0	−1220.1 kJ / mol
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Strontium carbonate , also outdated carbonic acid strontium , is the carbonate of strontium . It has the empirical formula SrCO ₃ .

Occurrence

Strontium carbonate is found in nature as the mineral strontianite .

presentation

The preparation of strontium carbonate is effected by fusion of the mineral celestite (SrSO ₄ ) and soda ( sodium carbonate ):

${\displaystyle \mathrm {SrSO_{4}+Na_{2}CO_{3}\rightarrow SrCO_{3}+Na_{2}SO_{4}} }$

properties

Strontium carbonate is a fine, white powder that has properties similar to calcium carbonate . The salt serves as the starting material for the production of most strontium compounds.

Strontium carbonate does not dissolve in pure water , but in water containing carbon dioxide / carbonic acid . Here forms Strontiumhydrogencarbonat :

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

In mineral acids , soluble strontium salts are formed from strontium carbonate. The formation of carbonic acid is observed, which further breaks down into water and carbon dioxide.

${\displaystyle \mathrm {SrCO_{3}+2\ HCl\rightarrow SrCl_{2}+\ H_{2}O+CO_{2}\uparrow } }$

At 1268 ° C under normal air pressure , the chemical compound splits into strontium oxide and carbon dioxide :

${\displaystyle \mathrm {SrCO_{3}\ _{\overrightarrow {1268\,^{\circ }\mathrm {C} }}\ SrO+CO_{2}\uparrow } }$

If the air pressure is increased to approx. 70 bar , strontium carbonate melts at 1497 ° C.

use

Strontium carbonate is used in ferrite magnets and serves as an absorber for X-rays in color television tubes . Electrolysis - Zinc can be cleaned with strontium carbonate. It is also used in glazes and, because of the red color of the flame, in pyrotechnics .

In the past, it was occasionally used in medicine to treat schizophrenia . However, it is no longer used because of the availability of more tolerable agents. Today the substance is only used in homeopathy under the name Strontium carbonicum , for example for osteoarthritis and cerebral sclerosis .

In organic synthesis, strontium carbonate can be used together with hydrogen and palladium for the selective reduction of double bonds .

swell

1. ↑ ^{a b c d e f} Entry on strontium carbonate in the GESTIS substance database of the IFA , accessed on December 19, 2019 (JavaScript required)
2. ^ Richard C. Ropp: Encyclopedia of the Alkaline Earth Compounds . Newnes, 2012, ISBN 0-444-59553-8 , pp. 367 ( limited preview in Google Book search).
3. ↑ 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. 5-20.
4. ↑ M. Binnewies et alii: Allgemeine und Anorganische Chemie . 2nd Edition. Spectrum, 2010, ISBN 3-8274-2533-6 , pp. 383 .
5. ↑ Michael B Smith: Organic Synthesis. Academic Press, 2011, p. 431 ( limited preview in Google Book Search).