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3(NH4)2S2O3 ๐Ÿ”ฅโ†’ 6NH3โ†‘ + 2H2Sโ†‘ + H2SO3 + 3SO2โ†‘

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Decomposition of ammonium thiosulfate
3(NH4)2S2O3Ammonium thiosulfate
๐Ÿ”ฅ
โŸถ
6NH3โ†‘Ammonia + 2H2Sโ†‘Hydrogen sulfide + H2SO3Sulfurous acid + 3SO2โ†‘Sulfur dioxide

Decomposition of ammonium thiosulfate yields ammonia, hydrogen sulfide, sulfurous acid, 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
6NH3โ†‘Ammonia + 2H2Sโ†‘Hydrogen sulfide + H2SO3Sulfurous acid + 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
NH3Ammonia6
โ€“
โ€“
H2SHydrogen sulfide2
Reduced
โ€“
H2SO3Sulfurous acid1
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
6NH3โ†‘Gas + 2H2Sโ†‘Gas + H2SO3Un-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
934.1โ€“โ€“โ€“
311.4โ€“โ€“โ€“
per 1 mol of
155.7โ€“โ€“โ€“
per 1 mol of
467.1โ€“โ€“โ€“
per 1 mol of
934.1โ€“โ€“โ€“
per 1 mol of
311.4โ€“โ€“โ€“

Changes in aqueous solution (2)

Decomposition of ammonium thiosulfate
3(NH4)2S2O3Aqueous solution
๐Ÿ”ฅ
โŸถ
6NH3โ†‘Gas + 2H2Sโ†‘Gas + H2SO3Un-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
855.6โ€“โ€“โ€“
285.2โ€“โ€“โ€“
per 1 mol of
142.6โ€“โ€“โ€“
per 1 mol of
427.8โ€“โ€“โ€“
per 1 mol of
855.6โ€“โ€“โ€“
per 1 mol of
285.2โ€“โ€“โ€“

Changes in aqueous solution (3)

Decomposition of ammonium thiosulfate
3(NH4)2S2O3Aqueous solution
๐Ÿ”ฅ
โŸถ
6NH3โ†‘Gas + 2H2Sโ†‘Un-ionized aqueous solution + H2SO3Un-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
895.9โ€“โ€“โ€“
298.6โ€“โ€“โ€“
per 1 mol of
149.3โ€“โ€“โ€“
per 1 mol of
447.9โ€“โ€“โ€“
per 1 mol of
895.9โ€“โ€“โ€“
per 1 mol of
298.6โ€“โ€“โ€“

Changes in aqueous solution (4)

Decomposition of ammonium thiosulfate
3(NH4)2S2O3Aqueous solution
๐Ÿ”ฅ
โŸถ
6NH3โ†‘Gas + 2H2Sโ†‘Un-ionized aqueous solution + H2SO3Un-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
817.5โ€“โ€“โ€“
272.5โ€“โ€“โ€“
per 1 mol of
136.3โ€“โ€“โ€“
per 1 mol of
408.8โ€“โ€“โ€“
per 1 mol of
817.5โ€“โ€“โ€“
per 1 mol of
272.5โ€“โ€“โ€“

Changes in aqueous solution (5)

Decomposition of ammonium thiosulfate
3(NH4)2S2O3Aqueous solution
๐Ÿ”ฅ
โŸถ
6NH3โ†‘Un-ionized aqueous solution + 2H2Sโ†‘Gas + H2SO3Un-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
729.0โ€“โ€“โ€“
243.0โ€“โ€“โ€“
per 1 mol of
121.5โ€“โ€“โ€“
per 1 mol of
364.5โ€“โ€“โ€“
per 1 mol of
729.0โ€“โ€“โ€“
per 1 mol of
243.0โ€“โ€“โ€“

Changes in aqueous solution (6)

Decomposition of ammonium thiosulfate
3(NH4)2S2O3Aqueous solution
๐Ÿ”ฅ
โŸถ
6NH3โ†‘Un-ionized aqueous solution + 2H2Sโ†‘Gas + H2SO3Un-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
650.6โ€“โ€“โ€“
216.9โ€“โ€“โ€“
per 1 mol of
108.4โ€“โ€“โ€“
per 1 mol of
325.3โ€“โ€“โ€“
per 1 mol of
650.6โ€“โ€“โ€“
per 1 mol of
216.9โ€“โ€“โ€“

Changes in aqueous solution (7)

Decomposition of ammonium thiosulfate
3(NH4)2S2O3Aqueous solution
๐Ÿ”ฅ
โŸถ
6NH3โ†‘Un-ionized aqueous solution + 2H2Sโ†‘Un-ionized aqueous solution + H2SO3Un-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
690.9โ€“โ€“โ€“
230.3โ€“โ€“โ€“
per 1 mol of
115.1โ€“โ€“โ€“
per 1 mol of
345.4โ€“โ€“โ€“
per 1 mol of
690.9โ€“โ€“โ€“
per 1 mol of
230.3โ€“โ€“โ€“

Changes in aqueous solution (8)

Decomposition of ammonium thiosulfate
3(NH4)2S2O3Aqueous solution
๐Ÿ”ฅ
โŸถ
6NH3โ†‘Un-ionized aqueous solution + 2H2Sโ†‘Un-ionized aqueous solution + H2SO3Un-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
612.4โ€“โ€“โ€“
204.1โ€“โ€“โ€“
per 1 mol of
102.1โ€“โ€“โ€“
per 1 mol of
306.2โ€“โ€“โ€“
per 1 mol of
612.4โ€“โ€“โ€“
per 1 mol of
204.1โ€“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
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€“
H2SO3 (ao)-608.81[1]-537.81[1]232.2[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€“
* (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)