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3AsI3 + 20HNO3 🔥→ 3H3AsO4 + 9HIO3 + 20NO↑ + H2O

The reaction of arsenic triiodide and nitric acid yields arsenic acid, iodic acid, nitrogen monoxide, and water (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 triiodide3
Reducing
Reducing
HNO3Nitric acid20
Oxidizing
Oxidizing

Products

Chemical formulaNameCoefficientTypeType in general
equation
H3AsO4Arsenic acid3
Oxidized
HIO3Iodic acid9
Oxidized
NONitrogen monoxide20
Reduced
H2OWater1

Thermodynamic changes

Changes in standard condition

Reaction of arsenic triiodide and nitric acid
3AsI3Crystalline solid + 20HNO3Liquid
🔥
3H3AsO4Crystalline solid + 9HIO3Crystalline solid + 20NOGas + H2OLiquid
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
386.0
per 1 mol of
128.7
per 1 mol of
19.30
per 1 mol of
128.7
per 1 mol of
42.89
per 1 mol of
19.30
per 1 mol of
386.0

Changes in aqueous solution (1)

Reaction of arsenic triiodide and nitric acid
ΔrG405.7 kJ/mol
K0.84 × 10−71
pK71.08
3AsI3Crystalline solid + 20HNO3Ionized aqueous solution
🔥
3H3AsO4Un-ionized aqueous solution + 9HIO3Un-ionized aqueous solution + 20NOGas + H2OLiquid
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
1231.8405.72772
per 1 mol of
410.60135.2924.0
per 1 mol of
61.59020.29138.6
per 1 mol of
410.60135.2924.0
per 1 mol of
136.8745.08308.0
per 1 mol of
61.59020.29138.6
per 1 mol of
1231.8405.72772

Changes in aqueous solution (2)

Reaction of arsenic triiodide and nitric acid
3AsI3Crystalline solid + 20HNO3Ionized aqueous solution
🔥
3H3AsO4Aqueous solution + 9HIO3Un-ionized aqueous solution + 20NOGas + H2OLiquid
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
1225.5
per 1 mol of
408.50
per 1 mol of
61.275
per 1 mol of
408.50
per 1 mol of
136.17
per 1 mol of
61.275
per 1 mol of
1225.5

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
H3AsO4 (cr)-906.3[1]
H3AsO4 (ao)-902.5[1]-766.0[1]184[1]
H3AsO4 (aq)-904.6[1]
HIO3 (cr)-230.1[1]
HIO3 (ao)-211.3[1]-132.6[1]166.9[1]
NO (g)90.25[1]86.55[1]210.761[1]29.844[1]
H2O (cr)
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]
* (cr):Crystalline solid, (ao):Un-ionized aqueous solution, (aq):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)