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(NH4)3AsO4 + 3HNO3 → 3NH2OH + 3HNO2 + H3AsO4

The reaction of ammonium arsenate and nitric acid yields hydroxylamine, nitrous acid, and arsenic acid (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

General equation

Reaction of reducing species and oxidizing species
Reducing speciesReducing agent + Oxidizing speciesOxidizing agent
ProductOxidation product + ProductReduction product

Oxidation state of each atom

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
(NH4)3AsO4Ammonium arsenate1
Reducing
Reducing
HNO3Nitric acid3
Oxidizing
Oxidizing

Products

Chemical formulaNameCoefficientTypeType in general
equation
NH2OHHydroxylamine3
Oxidized
HNO2Nitrous acid3
Reduced
H3AsO4Arsenic acid1

Thermodynamic changes

Changes in standard condition (1)

Reaction of ammonium arsenate and nitric acid
(NH4)3AsO4Ionized aqueous solution + 3HNO3Ionized aqueous solution
3NH2OHAqueous solution + 3HNO2Un-ionized aqueous solution + H3AsO4Un-ionized 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
352.7
per 1 mol of
352.7
per 1 mol of
117.6
per 1 mol of
Hydroxylamine
117.6
per 1 mol of
117.6
per 1 mol of
352.7

Changes in standard condition (2)

Reaction of ammonium arsenate and nitric acid
(NH4)3AsO4Ionized aqueous solution + 3HNO3Ionized aqueous solution
3NH2OHAqueous solution + 3HNO2Un-ionized aqueous solution + H3AsO4Aqueous 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
350.6
per 1 mol of
350.6
per 1 mol of
116.9
per 1 mol of
Hydroxylamine
116.9
per 1 mol of
116.9
per 1 mol of
350.6

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
(NH4)3AsO4 (cr)-1286.2[1]
(NH4)3AsO4 (ai)-1285.66[1]-886.32[1]177.4[1]
(NH4)3AsO4 (cr)
3 hydrate
-2166.9[1]
HNO3 (l)-174.10[1]-80.71[1]155.60[1]109.87[1]
HNO3 (g)-135.06[1]-74.72[1]266.38[1]53.35[1]
HNO3 (ai)-207.36[1]-111.25[1]146.4[1]-86.6[1]
HNO3 (l)
1 hydrate
-473.46[1]-328.77[1]216.90[1]182.46[1]
HNO3 (l)
3 hydrate
-1056.04[1]-811.09[1]346.98[1]325.14[1]
* (cr):Crystalline solid, (ai):Ionized aqueous solution, (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
NH2OH (cr)-114.2[1]
NH2OH (aq)-98.3[1]
HNO2 (g)
cis
-77.99[1]-42.94[1]248.76[1]44.77[1]
HNO2 (g)
trans
-80.12[1]-45.24[1]249.22[1]46.07[1]
HNO2 (g)-79.5[1]-46.0[1]254.1[1]45.6[1]
HNO2 (ao)-119.2[1]-50.6[1]135.6[1]
H3AsO4 (cr)-906.3[1]
H3AsO4 (ao)-902.5[1]-766.0[1]184[1]
H3AsO4 (aq)-904.6[1]
* (cr):Crystalline solid, (aq):Aqueous solution, (g):Gas, (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)