Kalcijum sulfid

Kalcijum-sulfid
	Kalcijum-sulfid
Drugi nazivi	kalcijum-monosulfid,; „sodni otpadak“
Identifikacija
CAS registarski broj	20548-54-3
PubChem	10197613
ChemSpider	8373113
UNII	1MBW07J51Q
KEGG	C17392
MeSH	Calcium+sulfide
Jmol-3D slike	Slika 1
SMILES
	[S-2].[Ca+2]
InChI
	InChI=1S/Ca.S/q+2;-2 ; Kod: AGVJBLHVMNHENQ-UHFFFAOYSA-N InChI=1/Ca.S/rCaS/c1-2
Svojstva
Molekulska formula	CaS
Molarna masa	72.14 g/mol
Agregatno stanje	Beli prah
Gustina	2.600 g/ml
	; ; Ukoliko nije drugačije napomenuto, podaci se odnose na standardno stanje (25 °C, 100 kPa) materijala
	Infobox references

| Section6 = | Section7 = ! align="center" cellspacing="3" style="border: 1px solid #C0C090; background-color: #F8EABA; margin-bottom: 3px;" colspan="2" | Opasnost

|-

| Opasnost u toku rada | izvor vodonik-sulfida |-

| NFPA 704 |

0

1

0

|- | R-oznake | R31 R36/37/38 R50 |- | S-oznake | S28 S61 |- | Section8 = ! align="center" cellspacing="3" style="border: 1px solid #C0C090; background-color: #F8EABA; margin-bottom: 3px;" colspan="2" | Srodna jedinjenja |- | Drugi anjoni | CaO |- | Drugi katjoni | MgS, BaS |- | Srodna jedinjenja/sulfidi | Na₂S |- }}

Kalcijum-sulfid je neorgansko hemijsko jedinjenje hemijske formule CaS.

Fizička i hemijska svojstva

Kada je čist, kalcijum-sulfid je beli prah postojan na vazduhu bez prisustva vlage. U prisustvu vlage, a pod uticajem ugljen-dioksida, izgleda da nastaje vodonik-sulfid koji se može prepoznati po mirisu. To je ono što ovu supstancu čini potencijalno opasnom.^[5]

Kalcijum-sulfid pokazuje izrazitu fosforescenciju, ali samo ako sadrži neznatne tragove metalnih primesa, kao što je bizmut.^[5]

Voda hidrolizuje kalcijum-sulfid i tada se stvara smeša Ca(SH)₂, Ca(OH)₂, i Ca(SH)(OH).^[5]

CaS + H₂O → Ca(SH)(OH) + H₂S

Ca(SH)(OH) + H₂O → Ca(OH)₂ + H₂S

Osobina	Vrednost
Particioni koeficijent^[6] (ALogP)	0,6
Rastvorljivost^[7] (logS, log(mol/L))	2,0
Polarna površina^[8] (PSA, Å²)	95,5

Dobijanje

Jedan je od produkata Leblankovog procesa.^[5]
Zagrevanjem gašenog kreča u atmosferi vodonik-sulfida.^[5]
Redukcijom sulfata ugljenikom.^[5]

CaSO₄ + 2 C → CaS + 2 CO₂

i može da reaguje dalje:

3 CaSO₄ + CaS → 4 CaO + 4 SO₂

Polisulfidi

Kalcijum-polusulfidi (CaS_n) se grade kada se krečno mleko kuva sa sumporom.

Ca(OH)₂ + 10S → 2CaS₄ + CaS₂O₃ + 3H₂O

Tetrasulfid dalje sa viškom sumpora gradi pentasulfid.^[5]

Reference

↑ Li Q, Cheng T, Wang Y, Bryant SH (2010). „PubChem as a public resource for drug discovery.”. Drug Discov Today 15 (23-24): 1052-7. DOI:10.1016/j.drudis.2010.10.003. PMID 20970519. edit
↑ Evan E. Bolton, Yanli Wang, Paul A. Thiessen, Stephen H. Bryant (2008). „Chapter 12 PubChem: Integrated Platform of Small Molecules and Biological Activities”. Annual Reports in Computational Chemistry 4: 217-241. DOI:10.1016/S1574-1400(08)00012-1.
↑ Hettne KM, Williams AJ, van Mulligen EM, Kleinjans J, Tkachenko V, Kors JA. (2010). „Automatic vs. manual curation of a multi-source chemical dictionary: the impact on text mining”. J Cheminform 2 (1): 3. DOI:10.1186/1758-2946-2-3. PMID 20331846. edit
↑ Joanne Wixon, Douglas Kell (2000). „Website Review: The Kyoto Encyclopedia of Genes and Genomes — KEGG”. Yeast 17 (1): 48–55. DOI:10.1002/(SICI)1097-0061(200004)17:1<48::AID-YEA2>3.0.CO;2-H.
↑ ^5,0 ^5,1 ^5,2 ^5,3 ^5,4 ^5,5 ^5,6 Parkes, G.D. & Phil, D. 1973. Melorova moderna neorganska hemija. Naučna knjiga. Beograd.
↑ Ghose, A.K., Viswanadhan V.N., and Wendoloski, J.J. (1998). „Prediction of Hydrophobic (Lipophilic) Properties of Small Organic Molecules Using Fragment Methods: An Analysis of AlogP and CLogP Methods”. J. Phys. Chem. A 102: 3762-3772. DOI:10.1021/jp980230o.
↑ Tetko IV, Tanchuk VY, Kasheva TN, Villa AE. (2001). „Estimation of Aqueous Solubility of Chemical Compounds Using E-State Indices”. Chem Inf. Comput. Sci. 41: 1488-1493. DOI:10.1021/ci000392t. PMID 11749573.
↑ Ertl P., Rohde B., Selzer P. (2000). „Fast calculation of molecular polar surface area as a sum of fragment based contributions and its application to the prediction of drug transport properties”. J. Med. Chem. 43: 3714-3717. DOI:10.1021/jm000942e. PMID 11020286.

Literatura

Holleman A. F., Wiberg E. (2001). Inorganic Chemistry (1st edition izd.). San Diego: Academic Press. ISBN 0-12-352651-5.
Housecroft C. E., Sharpe A. G. (2008). Inorganic Chemistry (3rd izd.). Prentice Hall. ISBN 978-0-13-175553-6.

Spoljašnje veze

Portal Hemija

Calcium sulfide

[1] Li Q, Cheng T, Wang Y, Bryant SH (2010). „PubChem as a public resource for drug discovery.”. Drug Discov Today 15 (23-24): 1052-7. DOI:10.1016/j.drudis.2010.10.003. PMID 20970519. edit

[2] Evan E. Bolton, Yanli Wang, Paul A. Thiessen, Stephen H. Bryant (2008). „Chapter 12 PubChem: Integrated Platform of Small Molecules and Biological Activities”. Annual Reports in Computational Chemistry 4: 217-241. DOI:10.1016/S1574-1400(08)00012-1.

[3] Hettne KM, Williams AJ, van Mulligen EM, Kleinjans J, Tkachenko V, Kors JA. (2010). „Automatic vs. manual curation of a multi-source chemical dictionary: the impact on text mining”. J Cheminform 2 (1): 3. DOI:10.1186/1758-2946-2-3. PMID 20331846. edit

[4] Joanne Wixon, Douglas Kell (2000). „Website Review: The Kyoto Encyclopedia of Genes and Genomes — KEGG”. Yeast 17 (1): 48–55. DOI:10.1002/(SICI)1097-0061(200004)17:1<48::AID-YEA2>3.0.CO;2-H.

[мел-5] 5,0 ^5,1 ^5,2 ^5,3 ^5,4 ^5,5 ^5,6 Parkes, G.D. & Phil, D. 1973. Melorova moderna neorganska hemija. Naučna knjiga. Beograd.

[6] Ghose, A.K., Viswanadhan V.N., and Wendoloski, J.J. (1998). „Prediction of Hydrophobic (Lipophilic) Properties of Small Organic Molecules Using Fragment Methods: An Analysis of AlogP and CLogP Methods”. J. Phys. Chem. A 102: 3762-3772. DOI:10.1021/jp980230o.

[7] Tetko IV, Tanchuk VY, Kasheva TN, Villa AE. (2001). „Estimation of Aqueous Solubility of Chemical Compounds Using E-State Indices”. Chem Inf. Comput. Sci. 41: 1488-1493. DOI:10.1021/ci000392t. PMID 11749573.

[8] Ertl P., Rohde B., Selzer P. (2000). „Fast calculation of molecular polar surface area as a sum of fragment based contributions and its application to the prediction of drug transport properties”. J. Med. Chem. 43: 3714-3717. DOI:10.1021/jm000942e. PMID 11020286.

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