question: Hvorfor vi kalder kalcium sulfat hemihydrater som gips af paris?
context: Calcium sulfate
  Calciumsulfat
  
  
  
  
  
  
  
  Navne
  
  
  Andre navne
  Parisergips
  Drierit
  Gips
  
  
  
  Identifikatorer
  
  
  
  CAS-nummer
  
  
  
  
  7778-18-9 Y
  10034-76-1 (hæmihydrat) N
  10101-41-4 (dihydrat) N
  
  
  
  
  
  
  3D-model (JSmol)
  
  
  
  
  Interaktivt billede
  
  
  
  
  
  ChEBI
  
  
  
  CHEBI:31346 Y
  
  
  
  
  
  ChemSpider
  
  
  
  22905 Y
  
  
  
  
  
  ECHA InfoCard
  100.029.000
  
  
  E-nummer
  E516 (surhedsregulerende midler, ...)
  
  
  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-2 Y
  nøgle: OSGAYBCDTDRGGQ-UHFFFAOYSA-L Y
  
  
  
  
  InChI=1/Ca.H2O4S/c;1-5(2,3)4/h;(H2,1,2,3,4)/q+2;/p-2
  nøgle: OSGAYBCDTDRGGQ-NUQVWONBAU
  
  
  
  
  
  
  
  
  
  SMILES[show]
  
  
  [Ca+2].[O-]S([O-])(=O)=O
  
  
  
  
  
  
  Egenskaber
  
  
  
  Kemisk formel
  
  CaSO4
  
  
  Molar masse
  136,14 g/mol (vandfri)
  145,15 g/mol (hemihydrat)
  172,172 g/mol (dihydrat)
  
  
  Udseende
  hvidt fast stof
  
  
  Lugt
  lugtfri
  
  
  Massefylde
  2,96 g/cm3 (vandfri)
  2,32 g/cm3 (dihydrat)
  
  
  Smeltepunkt
  1.460 °C (2.660 °F; 1.730 K) (vandfri)
  
  
  
  Opløselighed i vand
  
  0,21 g/100 ml ved 20 °C (vandfri)
  0,24 g/100 ml ved 20 °C (dihydrat)
  
  
  
  Opløselighedsprodukt (Ksp)
  
  4,93 × 10-5 mol2L-2 (vandfri)
  3,14 × 10-5 (dihydrat)
  
  
  
  Opløselighed i glycerol
  let opløseligt (dihydrat)
  
  
  Surhedsgrad (pKa)
  10,4 (vandfri)
  7,3 (dihydrat)
  
  
  
  Magnetisk modtagelighed (χ)
  
  -49,7-10-6 cm3/mol
  
  
  Struktur
  
  
  
  Krystalstruktur
  
  orthorhombisk
  
  
  Termokemi
  
  
  
  Std molar
  entropi (So298)
  
  107 J-mol-1-K-1
  
  
  
  Std enthalpi af
  dannelse (ΔfHo298)
  
  -1433 kJ/mol
  
  
  Farer
  
  
  Sikkerhedsdatablad
  Se: dataside
  ICSC 1589
  
  
  NFPA 704
  
  
  
  
  
  
  
  
  
  
  
  0
  1
  0
  
  
  
  
  
  
  Flammepunkt
  Ikke brandfarlig
  
  
  Sundhedsgrænser for eksponering i USA (NIOSH):
  
  
  
  PEL (tilladte)
  
  TWA 15 mg/m3 (i alt) TWA 5 mg/m3 (resp) [kun for vandfri form]
  
  
  
  REL (anbefalet)
  
  TWA 10 mg/m3 (i alt) TWA 5 mg/m3 (resp) [kun vandfri]
  
  
  
  IDLH (umiddelbar fare)
  
  N.D.
  
  
  Relaterede forbindelser
  
  
  
  Andre kationer
  
  Magnesiumsulfat
  Strontiumsulfat
  Bariumsulfat
  
  
  
  Relaterede tørremidler
  
  Calciumchlorid
  Magnesiumsulfat
  
  
  
  Beslægtede forbindelser
  
  Parisgips
  Gips
  
  
  Supplerende data side
  
  
  
  Struktur og
  egenskaber
  
  Brydningsindeks (n),
  dielektrisk konstant (εr) osv.
  
  
  
  Termodynamisk
  data
  
  Faseadfærd
  fast-væske-gas
  
  
  
  Spektrale data
  
  UV, IR, NMR, MS
  
  
  
  
  Medmindre andet er angivet, er dataene angivet for materialer i standardtilstand (ved 25 °C [77 °F], 100 kPa).
  
  
  
  
  N verificere (hvad er YN ?)
  
  
  Infoboksreferencer
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