View source for Chemistry:Calcium sulfate (data page)

This page provides supplementary chemical data on [[Chemistry:Calcium sulfate|calcium sulfate]]. <!-- replace with proper wikilink -->
== Material Safety Data Sheet == <!-- KEEP this header, it is linked to from the infobox on the main article page -->

The handling of this chemical may incur notable safety precautions. It is highly recommend that you seek the material safety data sheet for this chemical from a reliable source and follow its directions. 
*Calcium Sulfate Dihydrate: [http://www.excalibar.com/pdf/MSDS%20-%20GPS.pdf Excaliber Minerals LLC]
*Calcium Sulfate Anhydrous: [https://web.archive.org/web/20120324194711/http://www.sciencelab.com/msds.php?msdsId=9923275 ScienceLab.com, Inc.]

== Structure and properties == <!-- KEEP this header, it is linked to from the infobox on the main article page -->

{| border="1" cellspacing="0" cellpadding="3" style="margin: 0 0 0 0.5em; background: #FFFFFF; border-collapse: collapse; border-color: #C0C090;"
! {{chembox header}} | Structure and properties
|-
| Index of refraction, ''n''<sub>D</sub>
| ? <!-- Please omit if not applicable -->
|-	 
| [[Abbe number]]	
|? <!-- Please omit if not applicable -->
|- 
| Dielectric constant, ε<sub>r</sub>
| ? ε<sub>0</sub> at ? °C <!-- Please omit if not applicable -->
|- 
| Bond strength
| ? <!-- Specify which bond. Please omit if not applicable -->
|- 
| [[Bond length]]
| ? <!-- Specify which bond. Please omit if not applicable -->
|- 
| Bond angle
| ? <!-- Specify which angle, e.g. Cl-P-O. Please omit if not applicable -->
|- 
| [[Physics:Magnetic susceptibility|Magnetic susceptibility]]
|  -49.7 x 10<sup>−6</sup> cm<sup>3</sup>/mol <ref>{{Cite book|title=CRC handbook of chemistry and physics : a ready-reference book of chemical and physical data.|url=https://archive.org/details/crchandbookchemi00lide_126|url-access=limited|date=2003|publisher=CRC Press|others=Lide, David R.|isbn=0849304849|edition=84th|location=Boca Raton, Fla.|pages=[https://archive.org/details/crchandbookchemi00lide_126/page/n794 4]–131|oclc=52548731}}</ref><!-- Please omit if not applicable -->
|-
|[[Physics:Melting point|Melting point]]
|1460&nbsp;°C<ref name="CRC handbook">{{Cite book|title=CRC handbook of chemistry and physics : a ready-reference book of chemical and physical data.|url=https://archive.org/details/crchandbookchemi00lide_126|url-access=limited|date=2003|publisher=CRC Press|others=Lide, David R.|isbn=0849304849|edition=84th|location=Boca Raton, Fla.|pages=[https://archive.org/details/crchandbookchemi00lide_126/page/n794 4]–50|oclc=52548731}}</ref>
|-
|Solubility in H<sub>2</sub>O
|0.205 g/100 g<ref name="CRC handbook" />
|-
|}

== Thermodynamic properties == <!-- KEEP this header, it is linked to from the infobox on the main article page -->

{| border="1" cellspacing="0" cellpadding="6" style="margin: 0 0 0 0.5em; background: #FFFFFF; border-collapse: collapse; border-color: #C0C090;"
! {{chembox header}} | Phase behavior
|-
| [[Chemistry:Triple point|Triple point]]
| ? K (? °C), ? Pa
|-
| Critical point
| ? K (? °C), ? Pa
|-
| Std enthalpy change<br/>of fusion, Δ<sub>fus</sub>''H''<sup><s>o</s></sup>
| 205.668 kJ/mol
|-
| Std entropy change<br/>of fusion, Δ<sub>fus</sub>''S''<sup><s>o</s></sup>
| ? J/(mol·K)
|-
| Std enthalpy change<br/>of vaporization, Δ<sub>vap</sub>''H''<sup><s>o</s></sup>
| ? kJ/mol
|-
| Std entropy change<br/>of vaporization, Δ<sub>vap</sub>''S''<sup><s>o</s></sup>
| ? J/(mol·K)
|-
! {{chembox header}} | Solid properties
|-
| Std enthalpy change<br/>of formation, Δ<sub>f</sub>''H''<sup><s>o</s></sup><sub>solid</sub>
| -1434.5 kJ/mol
|-
| [[Chemistry:Standard molar entropy|Standard molar entropy]],<br/>''S''<sup><s>o</s></sup><sub>solid</sub>
| 106.5 J/(mol K)
|-
| [[Physics:Heat capacity|Heat capacity]], ''c<sub>p</sub>''
| 99.7 J/(mol K)
|-
! {{chembox header}} | Liquid properties
|-
| Std enthalpy change<br/>of formation, Δ<sub>f</sub>''H''<sup><s>o</s></sup><sub>liquid</sub>
| ? kJ/mol
|-
| [[Chemistry:Standard molar entropy|Standard molar entropy]],<br/>''S''<sup><s>o</s></sup><sub>liquid</sub>
| ? J/(mol K)
|-
| [[Physics:Heat capacity|Heat capacity]], ''c<sub>p</sub>''
| ? J/(mol K)
|-
! {{chembox header}} | Gas properties
|-
| Std enthalpy change<br/>of formation, Δ<sub>f</sub>''H''<sup><s>o</s></sup><sub>gas</sub>
| ? kJ/mol
|-
| [[Chemistry:Standard molar entropy|Standard molar entropy]],<br/>''S''<sup><s>o</s></sup><sub>gas</sub>
| ? J/(mol K)
|-
| [[Physics:Heat capacity|Heat capacity]], ''c<sub>p</sub>''
| ? J/(mol K)
|-
|}

== Spectral data == <!-- KEEP this header, it is linked to from the infobox on the main article page -->

{| border="1" cellspacing="0" cellpadding="3" style="margin: 0 0 0 0.5em; background: #FFFFFF; border-collapse: collapse; border-color: #C0C090;"
! {{chembox header}} | UV-Vis
|-
| λ<sub>max</sub>
| ? [[Nanometre|nm]]
|-
| Extinction coefficient, ε
| ? 
|-
! {{chembox header}} | [[Physics:Infrared|IR]]
|-
| Major absorption bands
| ? cm<sup>&minus;1</sup>
|-
! {{chembox header}} | NMR
|-
| Proton NMR <!-- Link to image of spectrum -->
| &nbsp;
|-
| Carbon-13 NMR <!-- Link to image of spectrum -->
| &nbsp;
|-
| Other NMR data <!-- Insert special data e.g. <sup>19</sup>F chem. shifts, omit if not used -->
| &nbsp;
|-
! {{chembox header}} | MS
|-
| Masses of <br>main fragments
| &nbsp; <!-- Give list of major fragments -->
|-
|}

==Solubility product==

* CaSO<sub>4</sub> · 2 H<sub>2</sub>O (gypsum) K<sub>sp</sub> = <math>3.14\times10^{-5}\mbox{mol}^2\mbox{L}^{-2}</math>; log K<sub>sp</sub> = ?
* CaSO<sub>4</sub> · 0.5 H<sub>2</sub>O (bassanite) K<sub>sp</sub> = ?; log K<sub>sp</sub> = ?
* CaSO<sub>4</sub> (anhydrite) K<sub>sp</sub> = <math>4.93\times10^{-5}\mbox{mol}^2\mbox{L}^{-2}</math>; log K<sub>sp</sub> = ?

== References ==
{{Reflist}}
<!-- [http://webbook.nist.gov/chemistry/ NIST Standard Reference Database] -->

Except where noted otherwise, data relate to standard ambient temperature and pressure.

Disclaimer applies.

[[Category:Calcium compounds]]
[[Category:Sulfate minerals]]

{{Sourceattribution|Calcium sulfate (data page)|1}}