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3B + 3HNO3 → H3BO3 + B2O3 + 3NO↑

The reaction of boron and nitric acid yields boric acid, diboron trioxide, and nitrogen monoxide (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

Reaction of boron and nitric acid

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
BBoron3
Reducing
Reducing
HNO3Nitric acid3
Oxidizing
Oxidizing

Products

Chemical formulaNameCoefficientTypeType in general
equation
H3BO3Boric acid1
Oxidized
B2O3Diboron trioxide1
Oxidized
NONitrogen monoxide3
Reduced

Thermodynamic changes

Changes in aqueous solution

Reaction of boron and nitric acid
ΔrG−1569.00 kJ/mol
K7.53 × 10274
pK−274.88
3BCrystalline solid + 3HNO3Ionized aqueous solution
H3BO3Un-ionized aqueous solution + B2O3Crystalline solid + 3NOGas
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
−1452.26−1569.00391.8
per 1 mol of
−484.087−523.000130.6
per 1 mol of
−484.087−523.000130.6
per 1 mol of
−1452.26−1569.00391.8
per 1 mol of
−1452.26−1569.00391.8
per 1 mol of
−484.087−523.000130.6

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
B (cr)0[1]0[1]5.86[1]11.09[1]
B (am)
x denotes undetermined zero point entropy
3.8[1]6.53+x[1]11.97[1]
B (g)562.7[1]518.8[1]153.45[1]20.799[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
H3BO3 (cr)-1094.33[1]-968.92[1]88.83[1]81.38[1]
H3BO3 (g)-994.1[1]
H3BO3 (ao)-1072.32[1]-968.75[1]162.3[1]
B2O3 (cr)-1272.77[1]-1193.65[1]53.97[1]62.93[1]
B2O3 (am)-1254.53[1]-1182.3[1]77.8[1]61.1[1]
B2O3 (g)-843.79[1]-831.97[1]279.81[1]66.86[1]
NO (g)90.25[1]86.55[1]210.761[1]29.844[1]
* (cr):Crystalline solid, (g):Gas, (ao):Un-ionized aqueous solution, (am):Amorphous solid

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)