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8Na2S + P4O10 + 6H2O → 8NaHS + 4Na2HPO4

The reaction of sodium sulfide, tetraphosphorus decaoxide, and water yields sodium hydrogensulfide and sodium hydrogenphosphate (Other reactions are here). This reaction is an acid-base reaction and is classified as follows:

Table of contents
  1. 1Reaction data
  2. 2Thermodynamic changes
  3. 3References
  4. 4Related reactions
  5. 5Related categories

Reaction data

Chemical equation

General equation

Oxidation state of each atom

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
Na2SSodium sulfide8
Brønsted base
Salt
P4O10Tetraphosphorus decaoxide1
Lewis acid
Acidic oxide
H2OWater6
Water

Products

Chemical formulaNameCoefficientTypeType in general
equation
NaHSSodium hydrogensulfide8
Acid salt
Na2HPO4Sodium hydrogenphosphate4
Acid salt

Thermodynamic changes

Changes in standard condition (1)

Reaction of sodium sulfide, tetraphosphorus decaoxide, and water
8Na2SCrystalline solid + P4O10Crystalline solidhexagonal + 6H2OLiquid
8NaHSCrystalline solid + 4Na2HPO4Crystalline solid
Standard enthalpy
of reaction
ΔrH°
kJ · mol−1
Standard
Gibbs energy
of reaction
ΔrG°
kJ · mol−1
Standard entropy
of reaction
ΔrS°
J · K−1 · mol−1
Standard heat
capacity of reaction
at constant pressure
ΔrCp°
J · K−1 · mol−1
per 1 mol of
Equation
−1272.9
per 1 mol of
−159.11
−1272.9
per 1 mol of
−212.15
−159.11
−318.23

Changes in standard condition (2)

Reaction of sodium sulfide, tetraphosphorus decaoxide, and water
8Na2SCrystalline solid + P4O10Amorphous solid + 6H2OLiquid
8NaHSCrystalline solid + 4Na2HPO4Crystalline solid
Standard enthalpy
of reaction
ΔrH°
kJ · mol−1
Standard
Gibbs energy
of reaction
ΔrG°
kJ · mol−1
Standard entropy
of reaction
ΔrS°
J · K−1 · mol−1
Standard heat
capacity of reaction
at constant pressure
ΔrCp°
J · K−1 · mol−1
per 1 mol of
Equation
−1215
per 1 mol of
−151.9
−1215
per 1 mol of
−202.5
−151.9
−303.8

Changes in aqueous solution

Reaction of sodium sulfide, tetraphosphorus decaoxide, and water
ΔrG−825.1 kJ/mol
K3.56 × 10144
pK−144.55
8Na2SIonized aqueous solution + P4O10Crystalline solidhexagonal + 6H2OLiquid
8NaHSIonized aqueous solution + 4Na2HPO4Ionized aqueous solution
Standard enthalpy
of reaction
ΔrH°
kJ · mol−1
Standard
Gibbs energy
of reaction
ΔrG°
kJ · mol−1
Standard entropy
of reaction
ΔrS°
J · K−1 · mol−1
Standard heat
capacity of reaction
at constant pressure
ΔrCp°
J · K−1 · mol−1
per 1 mol of
Equation
−874.0−825.1−162.3
per 1 mol of
−109.3−103.1−20.29
−874.0−825.1−162.3
per 1 mol of
−145.7−137.5−27.05
−109.3−103.1−20.29
−218.5−206.3−40.58

Thermodynamic data of reactants

Chemical formulaStandard enthalpy
of formation
ΔfH°
kJ · mol−1
Standard Gibbs
energy of
formation
ΔfG°
kJ · mol−1
Standard
molar entropy
S°
J · K−1 · mol−1
Standard molar
heat capacity at
constant pressure
Cp°
J · K−1 · mol−1
Na2S (cr)-364.8[1]-349.8[1]83.7[1]
Na2S (ai)-447.3[1]-438.1[1]103.3[1]
Na2S (cr)
4.5 hydrate
-1725.9[1]
Na2S (cr)
5 hydrate
-1886.6[1]
Na2S (cr)
9 hydrate
-3074.0[1]
P4O10 (cr)
hexagonal
-2984.0[1]-2697.7[1]228.86[1]211.71[1]
P4O10 (am)-3042[1]
H2O (cr)
H2O (l)-285.830[1]-237.129[1]69.91[1]75.291[1]
H2O (g)-241.818[1]-228.572[1]188.825[1]33.577[1]
* (cr):Crystalline solid, (ai):Ionized aqueous solution, (am):Amorphous solid, (l):Liquid, (g):Gas

Thermodynamic data of products

Chemical formulaStandard enthalpy
of formation
ΔfH°
kJ · mol−1
Standard Gibbs
energy of
formation
ΔfG°
kJ · mol−1
Standard
molar entropy
S°
J · K−1 · mol−1
Standard molar
heat capacity at
constant pressure
Cp°
J · K−1 · mol−1
NaHS (cr)-237.23[1]
NaHS (ai)-257.73[1]-249.81[1]121.8[1]
NaHS (cr)
2 hydrate
-838.47[1]
Na2HPO4 (cr)-1748.1[1]-1608.2[1]150.50[1]135.31[1]
Na2HPO4 (ai)-1772.38[1]-1612.98[1]84.5[1]
Na2HPO4 (cr)
2 hydrate
-2346.0[1]-2088.5[1]221.3[1]
Na2HPO4 (cr)
7 hydrate
-3821.7[1]-3279.8[1]434.59[1]
Na2HPO4 (cr)
12 hydrate
-5297.8[1]-4467.8[1]633.83[1]
* (cr):Crystalline solid, (ai):Ionized aqueous solution

References

List of references

  1. 1
    Janiel J. Reed (1989)
    The NBS Tables of Chemical Thermodynamic Properties: Selected Values for Inorganic and C1 and C2 Organic Substances in SI Units
    National Institute of Standards and Technology (NIST)