title: Sodium sulfate (data page)
text: # Sodium sulfate (data page)
  
  This page provides supplementary chemical data on sodium sulfate.
  
  ## Material Safety Data Sheet
  
  The handling of this chemical may incur notable safety precautions. It is highly recommend that you seek the Safety Data Sheet (SDS) for this chemical from the manufacturer and follow its directions.
  
  ## Structure and properties
  
  Structure and properties :
  
  | Index of refraction, $n_D$ | |
  | - | - |
  | Abbe number | ? |
  | Dielectric constant, $ε_r$ | anhydrous: 7.90 at r.t. decahydrate: 5.0 at r.t. pentahydrate: 7 at 250-290K |
  | Bond strength | ? |
  | Bond length | ? |
  | Bond angle | ? |
  | Magnetic susceptibility, $χ_m$ | anhydrous: -52 $x10^{−6}$ $cm^3$ $mol^{−1}$ decahydrate: -184 $x10^{−6}$ $cm^3$ $mol^{−1}$ |
  | Surface tension | 194.8 dyn/cm (194.8 mN/m) (at 900 °C) 184.7 dyn/cm (184.7 mN/m) (at 1077 °C) |
  
  ## Thermodynamic properties
  
  Phase behavior :
  
  | Triple point | ? K (? °C), ? Pa |
  | - | - |
  | Critical point | ? K (? °C), ? Pa |
  | Std enthalpy change of fusion, $Δ_{fus}H^o$ | 200.8 kJ/mol |
  | Std entropy change of fusion, $Δ_{fus}S^o$ | ? J/(mol·K) |
  | Std enthalpy change of vaporization, $Δ_{vap}H^o$ | ? kJ/mol |
  | Std entropy change of vaporization, $Δ_{vap}S^o$ | ? J/(mol·K) |
  | Solid properties ||
  | Std enthalpy change of formation, $Δ_fH^o_{solid}$ | -1387.1 kJ/mol |
  | Standard molar entropy, $S^o_{solid}$ | 149.6 J/(mol K) |
  | Heat capacity, $c_p$ | 128.2 J/(mol K) |
  | Entropy change of solution | 2.1 J/(mol K) |
  | Liquid properties ||
  | Std enthalpy change of formation, $Δ_fH^o_{liquid}$ | ? kJ/mol |
  | Standard molar entropy, $S^o_{liquid}$ | ? J/(mol K) |
  | Heat capacity, $c_p$ | ?kJ/(mol K) |
  | Gas properties ||
  | Std enthalpy change of formation, $Δ_fH^o_{gas}$ | -1033.62 kJ/mol |
  | Standard molar entropy, $S^o_{gas}$ | 346.84 J/(mol K) |
  | Heat capacity, $c_p$ | ? J/(mol K) |
  
  ## Spectral data
  
  UV-Vis :
  
  | $λ_{max}$ | ? nm |
  | - | - |
  | Extinction coefficient, ε | ? |
  | IR ||
  | Major absorption bands | (nujol mull, nujol pks not listed) Wave numbertransmittance 1124 $cm^{−1}10%$ (br) 638 $cm^{−1}42%$ 618 $cm^{−1}35%$ |
  | NMR ||
  | Proton NMR | |
  | Carbon-13 NMR | |
  | Other NMR data | |
  | MS ||
  | Masses of main fragments | |
  
  * view
  * Except where noted otherwise, data relate to Standard temperature and pressure.
  * Reliability of data general note.
  