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3(NH4)2S2O3 ๐Ÿ”ฅโ†’ (NH4)2SO3 + 4NH3โ†‘ + 2H2Sโ†‘ + 3SO2โ†‘

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Decomposition of ammonium thiosulfate
3(NH4)2S2O3Ammonium thiosulfate
๐Ÿ”ฅ
โŸถ
(NH4)2SO3Ammonium sulfite + 4NH3โ†‘Ammonia + 2H2Sโ†‘Hydrogen sulfide + 3SO2โ†‘Sulfur dioxide

Decomposition of ammonium thiosulfate yields ammonium sulfite, ammonia, hydrogen sulfide, and sulfur dioxide (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 thiosulfate
3(NH4)2S2O3Ammonium thiosulfate
๐Ÿ”ฅ
โŸถ
(NH4)2SO3Ammonium sulfite + 4NH3โ†‘Ammonia + 2H2Sโ†‘Hydrogen sulfide + 3SO2โ†‘Sulfur dioxide

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 thiosulfate

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
(NH4)2S2O3Ammonium thiosulfate3
โ€“
Thermally decomposable
Oxoacid salt

Products

Chemical formulaNameCoefficientTypeType in general
equation
(NH4)2SO3Ammonium sulfite1
Reduced
โ€“
NH3Ammonia4
โ€“
โ€“
H2SHydrogen sulfide2
Reduced
โ€“
SO2Sulfur dioxide3
Redoxed product
โ€“

Thermodynamic changes

Changes in aqueous solution (1)

Decomposition of ammonium thiosulfate
3(NH4)2S2O3Aqueous solution
๐Ÿ”ฅ
โŸถ
(NH4)2SO3Ionized aqueous solution + 4NH3โ†‘Gas + 2H2Sโ†‘Gas + 3SO2โ†‘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
734.7โ€“โ€“โ€“
244.9โ€“โ€“โ€“
per 1 mol of
734.7โ€“โ€“โ€“
per 1 mol of
183.7โ€“โ€“โ€“
per 1 mol of
367.4โ€“โ€“โ€“
per 1 mol of
244.9โ€“โ€“โ€“

Changes in aqueous solution (2)

Decomposition of ammonium thiosulfate
3(NH4)2S2O3Aqueous solution
๐Ÿ”ฅ
โŸถ
(NH4)2SO3Ionized aqueous solution + 4NH3โ†‘Gas + 2H2Sโ†‘Gas + 3SO2โ†‘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
656.3โ€“โ€“โ€“
218.8โ€“โ€“โ€“
per 1 mol of
656.3โ€“โ€“โ€“
per 1 mol of
164.1โ€“โ€“โ€“
per 1 mol of
328.1โ€“โ€“โ€“
per 1 mol of
218.8โ€“โ€“โ€“

Changes in aqueous solution (3)

Decomposition of ammonium thiosulfate
3(NH4)2S2O3Aqueous solution
๐Ÿ”ฅ
โŸถ
(NH4)2SO3Ionized aqueous solution + 4NH3โ†‘Gas + 2H2Sโ†‘Un-ionized aqueous solution + 3SO2โ†‘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
696.6โ€“โ€“โ€“
232.2โ€“โ€“โ€“
per 1 mol of
696.6โ€“โ€“โ€“
per 1 mol of
174.2โ€“โ€“โ€“
per 1 mol of
348.3โ€“โ€“โ€“
per 1 mol of
232.2โ€“โ€“โ€“

Changes in aqueous solution (4)

Decomposition of ammonium thiosulfate
3(NH4)2S2O3Aqueous solution
๐Ÿ”ฅ
โŸถ
(NH4)2SO3Ionized aqueous solution + 4NH3โ†‘Gas + 2H2Sโ†‘Un-ionized aqueous solution + 3SO2โ†‘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
618.1โ€“โ€“โ€“
206.0โ€“โ€“โ€“
per 1 mol of
618.1โ€“โ€“โ€“
per 1 mol of
154.5โ€“โ€“โ€“
per 1 mol of
309.1โ€“โ€“โ€“
per 1 mol of
206.0โ€“โ€“โ€“

Changes in aqueous solution (5)

Decomposition of ammonium thiosulfate
3(NH4)2S2O3Aqueous solution
๐Ÿ”ฅ
โŸถ
(NH4)2SO3Ionized aqueous solution + 4NH3โ†‘Un-ionized aqueous solution + 2H2Sโ†‘Gas + 3SO2โ†‘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
598.0โ€“โ€“โ€“
199.3โ€“โ€“โ€“
per 1 mol of
598.0โ€“โ€“โ€“
per 1 mol of
149.5โ€“โ€“โ€“
per 1 mol of
299.0โ€“โ€“โ€“
per 1 mol of
199.3โ€“โ€“โ€“

Changes in aqueous solution (6)

Decomposition of ammonium thiosulfate
3(NH4)2S2O3Aqueous solution
๐Ÿ”ฅ
โŸถ
(NH4)2SO3Ionized aqueous solution + 4NH3โ†‘Un-ionized aqueous solution + 2H2Sโ†‘Gas + 3SO2โ†‘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
519.5โ€“โ€“โ€“
173.2โ€“โ€“โ€“
per 1 mol of
519.5โ€“โ€“โ€“
per 1 mol of
129.9โ€“โ€“โ€“
per 1 mol of
259.8โ€“โ€“โ€“
per 1 mol of
173.2โ€“โ€“โ€“

Changes in aqueous solution (7)

Decomposition of ammonium thiosulfate
3(NH4)2S2O3Aqueous solution
๐Ÿ”ฅ
โŸถ
(NH4)2SO3Ionized aqueous solution + 4NH3โ†‘Un-ionized aqueous solution + 2H2Sโ†‘Un-ionized aqueous solution + 3SO2โ†‘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
559.9โ€“โ€“โ€“
186.6โ€“โ€“โ€“
per 1 mol of
559.9โ€“โ€“โ€“
per 1 mol of
140.0โ€“โ€“โ€“
per 1 mol of
279.9โ€“โ€“โ€“
per 1 mol of
186.6โ€“โ€“โ€“

Changes in aqueous solution (8)

Decomposition of ammonium thiosulfate
3(NH4)2S2O3Aqueous solution
๐Ÿ”ฅ
โŸถ
(NH4)2SO3Ionized aqueous solution + 4NH3โ†‘Un-ionized aqueous solution + 2H2Sโ†‘Un-ionized aqueous solution + 3SO2โ†‘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
481.4โ€“โ€“โ€“
160.5โ€“โ€“โ€“
per 1 mol of
481.4โ€“โ€“โ€“
per 1 mol of
120.3โ€“โ€“โ€“
per 1 mol of
240.7โ€“โ€“โ€“
per 1 mol of
160.5โ€“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)2S2O3 (aq)-917.1[1]โ€“โ€“โ€“
* (aq):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
(NH4)2SO3 (cr)-885.3[1]โ€“โ€“โ€“
(NH4)2SO3 (ai)-900.4[1]-645.0[1]197.5[1]โ€“
(NH4)2SO3 (cr)
1 hydrate
-1187.4[1]โ€“โ€“โ€“
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€“
H2S (g)-20.63[1]-33.56[1]205.79[1]34.23[1]
H2S (ao)-39.7[1]-27.83[1]121[1]โ€“
SO2 (l)-320.5[1]โ€“โ€“โ€“
SO2 (g)-296.830[1]-300.194[1]248.22[1]39.87[1]
SO2 (ao)-322.980[1]-300.676[1]161.9[1]โ€“
* (cr):Crystalline solid, (ai):Ionized aqueous solution, (g):Gas, (ao):Un-ionized aqueous solution, (l):Liquid

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)