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6(NH4)3AsO4 ๐Ÿ”ฅโ†’ 2NH4NO2 + 3As2O3 + 11H2O + 14NH3โ†‘

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Decomposition of ammonium arsenate
6(NH4)3AsO4Ammonium arsenate
๐Ÿ”ฅ
โŸถ
2NH4NO2Ammonium nitrite + 3As2O3Diarsenic trioxide + 11H2OWater + 14NH3โ†‘Ammonia

Decomposition of ammonium arsenate yields ammonium nitrite, diarsenic trioxide, water, and ammonia (Other reactions are here). This reaction is an oxidation-reduction 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

Decomposition of ammonium arsenate
6(NH4)3AsO4Ammonium arsenate
๐Ÿ”ฅ
โŸถ
2NH4NO2Ammonium nitrite + 3As2O3Diarsenic trioxide + 11H2OWater + 14NH3โ†‘Ammonia

General equation

Thermal decomposition with redox
Thermally decomposable substanceSelf redox agent
๐Ÿ”ฅ
โŸถ
ProductOxidation product + ProductReduction product
Thermal decomposition of oxoacid salt with redox
Oxoacid saltSelf redox agent
๐Ÿ”ฅ
โŸถ
ProductOxidation product + ProductReduction product

Oxidation state of each atom

Decomposition of ammonium arsenate

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
(NH4)3AsO4Ammonium arsenate6
Self redox agent
Thermally decomposable
Oxoacid salt

Products

Chemical formulaNameCoefficientTypeType in general
equation
NH4NO2Ammonium nitrite2
Oxidized
โ€“
As2O3Diarsenic trioxide3
Reduced
โ€“
H2OWater11
โ€“
โ€“
NH3Ammonia14
โ€“
โ€“

Thermodynamic changes

Changes in standard condition (1)

Decomposition of ammonium arsenate
6(NH4)3AsO4Crystalline solid
๐Ÿ”ฅ
โŸถ
2NH4NO2Crystalline solid + 3As2O3Crystalline solidoctahedral + 11H2OLiquid + 14NH3โ†‘Gas
Standard enthalpy
of reaction
ฮ”rHยฐ
kJ ยท molโˆ’1		Standard
Gibbs energy
of reaction
ฮ”rGยฐ
kJ ยท molโˆ’1		Standard entropy
of reaction
ฮ”rSยฐ
J ยท Kโˆ’1 ยท molโˆ’1		Standard heat
capacity of reaction
at constant pressure
ฮ”rCpยฐ
J ยท Kโˆ’1 ยท molโˆ’1
per 1 mol of
Equation
1443.6โ€“โ€“โ€“
per 1 mol of
240.60โ€“โ€“โ€“
per 1 mol of
721.80โ€“โ€“โ€“
per 1 mol of
481.20โ€“โ€“โ€“
per 1 mol of
131.24โ€“โ€“โ€“
per 1 mol of
103.11โ€“โ€“โ€“

Changes in standard condition (2)

Decomposition of ammonium arsenate
6(NH4)3AsO4Crystalline solid
๐Ÿ”ฅ
โŸถ
2NH4NO2Crystalline solid + 3As2O3Crystalline solidmonoclinic + 11H2OLiquid + 14NH3โ†‘Gas
Standard enthalpy
of reaction
ฮ”rHยฐ
kJ ยท molโˆ’1		Standard
Gibbs energy
of reaction
ฮ”rGยฐ
kJ ยท molโˆ’1		Standard entropy
of reaction
ฮ”rSยฐ
J ยท Kโˆ’1 ยท molโˆ’1		Standard heat
capacity of reaction
at constant pressure
ฮ”rCpยฐ
J ยท Kโˆ’1 ยท molโˆ’1
per 1 mol of
Equation
1450.1โ€“โ€“โ€“
per 1 mol of
241.68โ€“โ€“โ€“
per 1 mol of
725.05โ€“โ€“โ€“
per 1 mol of
483.37โ€“โ€“โ€“
per 1 mol of
131.83โ€“โ€“โ€“
per 1 mol of
103.58โ€“โ€“โ€“

Changes in aqueous solution (1)

Decomposition of ammonium arsenate
6(NH4)3AsO4Ionized aqueous solution
๐Ÿ”ฅ
โŸถ
2NH4NO2Ionized aqueous solution + 3As2O3Aqueous solution + 11H2OLiquid + 14NH3โ†‘Gas
Standard enthalpy
of reaction
ฮ”rHยฐ
kJ ยท molโˆ’1		Standard
Gibbs energy
of reaction
ฮ”rGยฐ
kJ ยท molโˆ’1		Standard entropy
of reaction
ฮ”rSยฐ
J ยท Kโˆ’1 ยท molโˆ’1		Standard heat
capacity of reaction
at constant pressure
ฮ”rCpยฐ
J ยท Kโˆ’1 ยท molโˆ’1
per 1 mol of
Equation
1569.5โ€“โ€“โ€“
per 1 mol of
261.58โ€“โ€“โ€“
per 1 mol of
784.75โ€“โ€“โ€“
per 1 mol of
523.17โ€“โ€“โ€“
per 1 mol of
142.68โ€“โ€“โ€“
per 1 mol of
112.11โ€“โ€“โ€“

Changes in aqueous solution (2)

Decomposition of ammonium arsenate
6(NH4)3AsO4Ionized aqueous solution
๐Ÿ”ฅ
โŸถ
2NH4NO2Ionized aqueous solution + 3As2O3Aqueous solution + 11H2OLiquid + 14NH3โ†‘Un-ionized aqueous solution
Standard enthalpy
of reaction
ฮ”rHยฐ
kJ ยท molโˆ’1		Standard
Gibbs energy
of reaction
ฮ”rGยฐ
kJ ยท molโˆ’1		Standard entropy
of reaction
ฮ”rSยฐ
J ยท Kโˆ’1 ยท molโˆ’1		Standard heat
capacity of reaction
at constant pressure
ฮ”rCpยฐ
J ยท Kโˆ’1 ยท molโˆ’1
per 1 mol of
Equation
1091.0โ€“โ€“โ€“
per 1 mol of
181.83โ€“โ€“โ€“
per 1 mol of
545.50โ€“โ€“โ€“
per 1 mol of
363.67โ€“โ€“โ€“
per 1 mol of
99.182โ€“โ€“โ€“
per 1 mol of
77.929โ€“โ€“โ€“

Thermodynamic data of reactants

Chemical formulaStandard enthalpy
of formation
ฮ”fHยฐ
kJ ยท molโˆ’1		Standard Gibbs
energy of
formation
ฮ”fGยฐ
kJ ยท molโˆ’1		Standard
molar entropy
Sยฐ
J ยท Kโˆ’1 ยท molโˆ’1		Standard molar
heat capacity at
constant pressure
Cpยฐ
J ยท Kโˆ’1 ยท molโˆ’1
(NH4)3AsO4 (cr)-1286.2[1]โ€“โ€“โ€“
(NH4)3AsO4 (ai)-1285.66[1]-886.32[1]177.4[1]โ€“
(NH4)3AsO4 (cr)
3 hydrate
-2166.9[1]โ€“โ€“โ€“
* (cr):Crystalline solid, (ai):Ionized aqueous solution

Thermodynamic data of products

Chemical formulaStandard enthalpy
of formation
ฮ”fHยฐ
kJ ยท molโˆ’1		Standard Gibbs
energy of
formation
ฮ”fGยฐ
kJ ยท molโˆ’1		Standard
molar entropy
Sยฐ
J ยท Kโˆ’1 ยท molโˆ’1		Standard molar
heat capacity at
constant pressure
Cpยฐ
J ยท Kโˆ’1 ยท molโˆ’1
NH4NO2 (cr)-256.5[1]โ€“โ€“โ€“
NH4NO2 (ai)-237.2[1]-111.6[1]236.4[1]-17.6[1]
As2O3 (cr)
octahedral
-656.97[1]-576.22[1]107.1[1]95.65[1]
As2O3 (cr)
monoclinic
-654.8[1]-576.97[1]117[1]โ€“
As2O3 (g)-604.6[1]-548.9[1]191[1]โ€“
As2O3 (aq)-626.8[1]โ€“โ€“โ€“
H2O (cr)โ€“โ€“โ€“โ€“
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]
NH3 (g)-46.11[1]-16.45[1]192.45[1]35.06[1]
NH3 (ao)-80.29[1]-26.50[1]111.3[1]โ€“
* (cr):Crystalline solid, (ai):Ionized aqueous solution, (g):Gas, (aq):Aqueous solution, (l):Liquid, (ao):Un-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)