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(NH4)3AsO4 + 3HNO3 → 3N2O↑ + H3AsO4 + 6H2O

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Reaction of ammonium arsenate and nitric acid
(NH4)3AsO4Ammonium arsenate + 3HNO3Nitric acid
⟶
3N2O↑Dinitrotgen monoxide + H3AsO4Arsenic acid + 6H2OWater

The reaction of ammonium arsenate and nitric acid yields dinitrotgen monoxide, arsenic acid, 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

Reaction of ammonium arsenate and nitric acid
(NH4)3AsO4Ammonium arsenate + 3HNO3Nitric acid
⟶
3N2O↑Dinitrotgen monoxide + H3AsO4Arsenic acid + 6H2OWater

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 ammonium arsenate and nitric acid

Reactants

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

Products

Chemical formulaNameCoefficientTypeType in general
equation
N2ODinitrotgen monoxide3
Redoxed product
–
H3AsO4Arsenic acid1
–
–
H2OWater6
–
–

Thermodynamic changes

Changes in standard condition

Reaction of ammonium arsenate and nitric acid
(NH4)3AsO4Crystalline solid + 3HNO3Liquid
⟶
3N2O↑Gas + H3AsO4Crystalline solid + 6H2OLiquid
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
−566.6–––
per 1 mol of
−566.6–––
per 1 mol of
−188.9–––
−188.9–––
per 1 mol of
−566.6–––
per 1 mol of
−94.43–––

Changes in aqueous solution (1)

Reaction of ammonium arsenate and nitric acid
◆
ΔrG−656.1 kJ/mol
K8.79 × 10114
pK−114.94
(NH4)3AsO4Ionized aqueous solution + 3HNO3Ionized aqueous solution
⟶
3N2O↑Gas + H3AsO4Un-ionized aqueous solution + 6H2OLiquid
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
−463.6−656.1646–
per 1 mol of
−463.6−656.1646–
per 1 mol of
−154.5−218.7215–
−154.5−218.7215–
per 1 mol of
−463.6−656.1646–
per 1 mol of
−77.27−109.4108–

Changes in aqueous solution (2)

Reaction of ammonium arsenate and nitric acid
(NH4)3AsO4Ionized aqueous solution + 3HNO3Ionized aqueous solution
⟶
3N2O↑Gas + H3AsO4Aqueous solution + 6H2OLiquid
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
−465.7–––
per 1 mol of
−465.7–––
per 1 mol of
−155.2–––
−155.2–––
per 1 mol of
−465.7–––
per 1 mol of
−77.62–––

Changes in aqueous solution (3)

Reaction of ammonium arsenate and nitric acid
(NH4)3AsO4Ionized aqueous solution + 3HNO3Ionized aqueous solution
⟶
3N2O↑Aqueous solution + H3AsO4Un-ionized aqueous solution + 6H2OLiquid
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
−541.4–––
per 1 mol of
−541.4–––
per 1 mol of
−180.5–––
−180.5–––
per 1 mol of
−541.4–––
per 1 mol of
−90.23–––

Changes in aqueous solution (4)

Reaction of ammonium arsenate and nitric acid
(NH4)3AsO4Ionized aqueous solution + 3HNO3Ionized aqueous solution
⟶
3N2O↑Aqueous solution + H3AsO4Aqueous solution + 6H2OLiquid
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
−543.5–––
per 1 mol of
−543.5–––
per 1 mol of
−181.2–––
−181.2–––
per 1 mol of
−543.5–––
per 1 mol of
−90.58–––

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
N2O (g)82.05[1]104.20[1]219.85[1]38.45[1]
N2O (aq)56.1[1]–––
H3AsO4 (cr)-906.3[1]–––
H3AsO4 (ao)-902.5[1]-766.0[1]184[1]–
H3AsO4 (aq)-904.6[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]
* (g):Gas, (aq):Aqueous solution, (cr):Crystalline solid, (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)