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2AsI3 + 20HNO3 → As2O5 + 6HIO3 + 14HNO2 + 3N2O3

The reaction of arsenic triiodide and nitric acid yields diarsenic pentaoxide, iodic acid, nitrous acid, and dinitrogen trioxide (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
AsI3Arsenic triiodide2
Reducing
Reducing
HNO3Nitric acid20
Oxidizing
Oxidizing

Products

Chemical formulaNameCoefficientTypeType in general
equation
As2O5Diarsenic pentaoxide1
Oxidized
HIO3Iodic acid6
Oxidized
HNO2Nitrous acid14
Reduced
N2O3Dinitrogen trioxide3
Reduced

Thermodynamic changes

Changes in standard condition

Reaction of arsenic triiodide and nitric acid
2AsI3Crystalline solid + 20HNO3Ionized aqueous solution
As2O5Aqueous solution + 6HIO3Un-ionized aqueous solution + 14HNO2Un-ionized aqueous solution + 3N2O3Gas
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
626.8
per 1 mol of
313.4
per 1 mol of
31.34
626.8
per 1 mol of
104.5
per 1 mol of
44.77
208.9

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
AsI3 (cr)-58.2[1]-59.4[1]213.05[1]105.77[1]
AsI3 (g)388.34[1]80.63[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, (g):Gas, (l):Liquid, (ai):Ionized aqueous solution

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
As2O5 (cr)-924.87[1]-782.3[1]105.4[1]116.52[1]
As2O5 (aq)-951.4[1]
As2O5 (cr)
4 hydrate
-2104.6[1]
HIO3 (cr)-230.1[1]
HIO3 (ao)-211.3[1]-132.6[1]166.9[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]
N2O3 (l)50.29[1]
N2O3 (g)83.72[1]139.46[1]312.28[1]65.61[1]
* (cr):Crystalline solid, (aq):Aqueous solution, (ao):Un-ionized aqueous solution, (g):Gas, (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)