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6As + 10HNO3 → 3As2O5 + 5N2O3↑ + 5H2↑

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Reaction of arsenic and nitric acid
6AsArsenic + 10HNO3Nitric acid
⟶
3As2O5Diarsenic pentaoxide + 5N2O3↑Dinitrogen trioxide + 5H2↑Hydrogen

The reaction of arsenic and nitric acid yields diarsenic pentaoxide, dinitrogen trioxide, and hydrogen (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

Reaction of arsenic and nitric acid
6AsArsenic + 10HNO3Nitric acid
⟶
3As2O5Diarsenic pentaoxide + 5N2O3↑Dinitrogen trioxide + 5H2↑Hydrogen

General equation

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

Oxidation state of each atom

Reaction of arsenic and nitric acid

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
AsArsenic6
Reducing
Reducing
HNO3Nitric acid10
Oxidizing
Oxidizing

Products

Chemical formulaNameCoefficientTypeType in general
equation
As2O5Diarsenic pentaoxide3
Oxidized
–
N2O3Dinitrogen trioxide5
Reduced
–
H2Hydrogen5
Reduced
–

Thermodynamic changes

Changes in standard condition (1)

Reaction of arsenic and nitric acid
◆
ΔrG−842.5 kJ/mol
K3.98 × 10147
pK−147.60
6AsCrystalline solidα, gray, metallic + 10HNO3Liquid
⟶
3As2O5Crystalline solid + 5N2O3↑Gas + 5H2↑Gas
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
−615.01−842.5764.4−424.81
per 1 mol of
−102.50−140.4127.4−70.802
per 1 mol of
−61.501−84.2576.44−42.481
−205.00−280.8254.8−141.60
−123.00−168.5152.9−84.962
per 1 mol of
−123.00−168.5152.9−84.962

Changes in standard condition (2)

Reaction of arsenic and nitric acid
6AsCrystalline solidγ, yellow, cubic + 10HNO3Liquid
⟶
3As2O5Crystalline solid + 5N2O3↑Gas + 5H2↑Gas
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
−702.6–––
per 1 mol of
−117.1–––
per 1 mol of
−70.26–––
−234.2–––
−140.5–––
per 1 mol of
−140.5–––

Changes in standard condition (3)

Reaction of arsenic and nitric acid
6AsAmorphous solidβ + 10HNO3Liquid
⟶
3As2O5Crystalline solid + 5N2O3↑Gas + 5H2↑Gas
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
−640.2–––
per 1 mol of
−106.7–––
per 1 mol of
−64.02–––
−213.4–––
−128.0–––
per 1 mol of
−128.0–––

Changes in aqueous solution (1)

Reaction of arsenic and nitric acid
6AsCrystalline solidα, gray, metallic + 10HNO3Ionized aqueous solution
⟶
3As2O5Aqueous solution + 5N2O3↑Gas + 5H2↑Gas
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
−362.0–––
per 1 mol of
−60.33–––
per 1 mol of
−36.20–––
−120.7–––
−72.40–––
per 1 mol of
−72.40–––

Changes in aqueous solution (2)

Reaction of arsenic and nitric acid
6AsCrystalline solidα, gray, metallic + 10HNO3Ionized aqueous solution
⟶
3As2O5Aqueous solution + 5N2O3↑Gas + 5H2↑Un-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
−383.0–––
per 1 mol of
−63.83–––
per 1 mol of
−38.30–––
−127.7–––
−76.60–––
per 1 mol of
−76.60–––

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
As (cr)
α, gray, metallic
0[1]0[1]35.1[1]24.64[1]
As (cr)
γ, yellow, cubic
14.6[1]–––
As (am)
β
4.2[1]–––
As (g)302.5[1]261.0[1]174.21[1]20.786[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, (am):Amorphous 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]–––
N2O3 (l)50.29[1]–––
N2O3 (g)83.72[1]139.46[1]312.28[1]65.61[1]
H2 (g)0[1]0[1]130.684[1]28.824[1]
H2 (ao)-4.2[1]17.6[1]577[1]–
* (cr):Crystalline solid, (aq):Aqueous solution, (l):Liquid, (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)