question: Hvorfor vi kaller kalsiumsulfat hemihydrater som gips av paris?
context: Calcium sulfate
  Kalsiumsulfat
  
  
  
  
  
  
  
  Navn
  
  
  Andre navn
  Gips
  Drieritt
  Gips
  
  
  
  Identifikatorer
  
  
  
  CAS-nummer
  
  
  
  
  7778-18-9 Y
  10034-76-1 (hemihydrat) N
  10101-41-4 (dihydrat) N
  
  
  
  
  
  
  3D-modell (JSmol)
  
  
  
  
  Interaktivt bilde
  
  
  
  
  
  ChEBI
  
  
  
  CHEBI:31346 Y
  
  
  
  
  
  ChemSpider
  
  
  
  22905 Y
  
  
  
  
  
  ECHA InfoCard
  100.029.000
  
  
  E-nummer
  E516 (surhetsregulatorer, ...)
  
  
  KEGG
  
  
  
  D09201 N
  
  
  
  
  
  
  PubChem CID
  
  
  
  
  24928
  
  
  
  
  
  RTECS-nummer
  WS6920000
  
  
  UNII
  
  
  
  E934B3V59H Y
  
  
  
  
  
  
  
  InChI[show]
  
  
  
  InChI=1S/Ca.H2O4S/c;1-5(2,3)4/h;(H2,1,2,3,4)/q+2;/p-2Y
  Nøkkel: OSGAYBCDTDRGGQ-UHFFFAOYSA-L Y
  
  
  
  
  InChI=1/Ca.H2O4S/c;1-5(2,3)4/h;(H2,1,2,3,4)/q+2;/p-2
  Nøkkel: OSGAYBCDTDRGGQ-NUQVWONBAU
  
  
  
  
  
  
  
  
  
  SMIL[vis]
  
  
  [Ca+2].[O-]S([O-])(=O)=O
  
  
  
  
  
  
  Eiendommer
  
  
  
  Kjemisk formel
  
  CaS04
  
  
  Molar masse
  136,14 g/mol (vannfri)
  145,15 g/mol (hemihydrat)
  172,172 g/mol (dihydrat)
  
  
  Utseende
  hvitt fast stoff
  
  
  Lukt
  luktfri
  
  
  Tetthet
  2,96 g/cm3 (vannfri)
  2,32 g/cm3 (dihydrat)
  
  
  Smeltepunkt
  1460 °C (2660 °F; 1730 K) (vannfri)
  
  
  
  Løselighet i vann
  
  0,21 g/100 ml ved 20 °C (vannfri)
  0,24 g/100 ml ved 20 °C (dihydrat)
  
  
  
  Løselighetsprodukt (Ksp)
  
  4,93 × 10−5 mol2L−2 (vannfri)
  3,14 × 10−5 (dihydrat)
  
  
  
  Løselighet i glyserol
  litt løselig (dihydrat)
  
  
  Surhet (pKa)
  10,4 (vannfri)
  7,3 (dihydrat)
  
  
  
  Magnetisk følsomhet (χ)
  
  -49,7·10−6 cm3/mol
  
  
  Struktur
  
  
  
  Krystallstruktur
  
  ortorombisk
  
  
  Termokjemi
  
  
  
  Std molar
  entropi (So298)
  
  107 J.mol-1.K-1
  
  
  
  Std entalpi av
  formasjon (ΔfHo298)
  
  -1433 kJ/mol
  
  
  Farer
  
  
  Sikkerhetsdatablad
  Se: dataside
  ICSC 1589
  
  
  NFPA 704
  
  
  
  
  
  
  
  
  
  
  
  0
  1
  0
  
  
  
  
  
  
  Flammepunkt
  Ikke brennbar
  
  
  Amerikanske helseeksponeringsgrenser (NIOSH):
  
  
  
  PEL (tillatt)
  
  TWA 15 mg/m3 (totalt) TWA 5 mg/m3 (resp.) [kun for vannfri form]
  
  
  
  REL (anbefalt)
  
  TWA 10 mg/m3 (totalt) TWA 5 mg/m3 (resp.) [kun vannfri]
  
  
  
  IDLH (umiddelbar fare)
  
  N.D.
  
  
  Beslektede forbindelser
  
  
  
  Andre kationer
  
  Magnesiumsulfat
  Strontiumsulfat
  Bariumsulfat
  
  
  
  Relaterte tørkemidler
  
  Kalsiumklorid
  Magnesiumsulfat
  
  
  
  Beslektede forbindelser
  
  Gips
  Gips
  
  
  Side med tilleggsdata
  
  
  
  Struktur og
  eiendommer
  
  Brytningsindeks (n),
  Dielektrisk konstant (εr), etc.
  
  
  
  Termodynamisk
  data
  
  Faseadferd
  fast-flytende-gass
  
  
  
  Spektraldata
  
  UV, IR, NMR, MS
  
  
  
  
  Med mindre annet er angitt, er data gitt for materialer i standardtilstand (ved 25 °C [77 °F], 100 kPa).
  
  
  
  
  N verifiser (hva er YN?)
  
  
  Infoboksreferanser
context_en: Calcium sulfate
  
  
  
  
  
  
  
  Names
  
  
  Other names
  Plaster of Paris
  Drierite
  Gypsum
  
  
  
  Identifiers
  
  
  
  CAS Number
  
  
  
  
  7778-18-9 Y
  10034-76-1 (hemihydrate) N
  10101-41-4 (dihydrate) N
  
  
  
  
  
  
  3D model (JSmol)
  
  
  
  
  Interactive image
  
  
  
  
  
  ChEBI
  
  
  
  CHEBI:31346 Y
  
  
  
  
  
  ChemSpider
  
  
  
  22905 Y
  
  
  
  
  
  ECHA InfoCard
  100.029.000
  
  
  E number
  E516 (acidity regulators, ...)
  
  
  KEGG
  
  
  
  D09201 N
  
  
  
  
  
  
  PubChem CID
  
  
  
  
  24928
  
  
  
  
  
  RTECS number
  WS6920000
  
  
  UNII
  
  
  
  E934B3V59H Y
  
  
  
  
  
  
  
  InChI[show]
  
  
  
  InChI=1S/Ca.H2O4S/c;1-5(2,3)4/h;(H2,1,2,3,4)/q+2;/p-2 Y
  Key: OSGAYBCDTDRGGQ-UHFFFAOYSA-L Y
  
  
  
  
  InChI=1/Ca.H2O4S/c;1-5(2,3)4/h;(H2,1,2,3,4)/q+2;/p-2
  Key: OSGAYBCDTDRGGQ-NUQVWONBAU
  
  
  
  
  
  
  
  
  
  SMILES[show]
  
  
  [Ca+2].[O-]S([O-])(=O)=O
  
  
  
  
  
  
  Properties
  
  
  
  Chemical formula
  
  CaSO4
  
  
  Molar mass
  136.14 g/mol (anhydrous)
  145.15 g/mol (hemihydrate)
  172.172 g/mol (dihydrate)
  
  
  Appearance
  white solid
  
  
  Odor
  odorless
  
  
  Density
  2.96 g/cm3 (anhydrous)
  2.32 g/cm3 (dihydrate)
  
  
  Melting point
  1,460 °C (2,660 °F; 1,730 K) (anhydrous)
  
  
  
  Solubility in water
  
  0.21g/100ml at 20 °C (anhydrous)
  0.24 g/100ml at 20 °C (dihydrate)
  
  
  
  Solubility product (Ksp)
  
  4.93 × 10−5 mol2L−2 (anhydrous)
  3.14 × 10−5 (dihydrate)
  
  
  
  Solubility in glycerol
  slightly soluble (dihydrate)
  
  
  Acidity (pKa)
  10.4 (anhydrous)
  7.3 (dihydrate)
  
  
  
  Magnetic susceptibility (χ)
  
  -49.7·10−6 cm3/mol
  
  
  Structure
  
  
  
  Crystal structure
  
  orthorhombic
  
  
  Thermochemistry
  
  
  
  Std molar
  entropy (So298)
  
  107 J·mol−1·K−1 
  
  
  
  Std enthalpy of
  formation (ΔfHo298)
  
  -1433 kJ/mol
  
  
  Hazards
  
  
  Safety data sheet
  See: data page
  ICSC 1589
  
  
  NFPA 704
  
  
  
  
  
  
  
  
  
  
  
  0
  1
  0
  
  
  
  
  
  
  Flash point
  Non-flammable
  
  
  US health exposure limits (NIOSH):
  
  
  
  PEL (Permissible)
  
  TWA 15 mg/m3 (total) TWA 5 mg/m3 (resp) [for anhydrous form only]
  
  
  
  REL (Recommended)
  
  TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp) [anhydrous only]
  
  
  
  IDLH (Immediate danger)
  
  N.D.
  
  
  Related compounds
  
  
  
  Other cations
  
  Magnesium sulfate
  Strontium sulfate
  Barium sulfate
  
  
  
  Related desiccants
  
  Calcium chloride
  Magnesium sulfate
  
  
  
  Related compounds
  
  Plaster of Paris
  Gypsum
  
  
  Supplementary data page
  
  
  
  Structure and
  properties
  
  Refractive index (n),
  Dielectric constant (εr), etc.
  
  
  
  Thermodynamic
  data
  
  Phase behaviour
  solid–liquid–gas
  
  
  
  Spectral data
  
  UV, IR, NMR, MS
  
  
  
  
  Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
  
  
  
  
  N verify (what is YN ?)
  
  
  Infobox references
title_en: Calcium sulfate