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2PbBr2 + 2HNO3 🔥→ 2PbO2 + Br2 + 2NO↑ + 2HBr↑

The reaction of lead(II) bromide and nitric acid yields lead(IV) oxide, bromine, nitrogen monoxide, and hydrogen bromide (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 hardly oxidizable species and oxidizing species
Hardly oxidizable speciesReducing agent + Oxidizing speciesOxidizing agent
ProductOxidation product + ProductReduction product

Oxidation state of each atom

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
PbBr2Lead(II) bromide2
Reducing
Hardly oxidizable
HNO3Nitric acid2
Oxidizing
Oxidizing

Products

Chemical formulaNameCoefficientTypeType in general
equation
PbO2Lead(IV) oxide2
Oxidized
Br2Bromine1
Oxidized
NONitrogen monoxide2
Reduced
HBrHydrogen bromide2

Thermodynamic changes

Changes in standard condition

Reaction of lead(II) bromide and nitric acid
ΔrG316.80 kJ/mol
K0.32 × 10−55
pK55.50
2PbBr2Crystalline solid + 2HNO3Liquid
🔥
2PbO2Crystalline solid + Br2Liquid + 2NOGas + 2HBrGas
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
458.5316.80474.1−57.04
per 1 mol of
229.3158.40237.1−28.52
per 1 mol of
229.3158.40237.1−28.52
per 1 mol of
229.3158.40237.1−28.52
per 1 mol of
458.5316.80474.1−57.04
per 1 mol of
229.3158.40237.1−28.52
per 1 mol of
229.3158.40237.1−28.52

Changes in aqueous solution (1)

Reaction of lead(II) bromide and nitric acid
ΔrG322.65 kJ/mol
K0.30 × 10−56
pK56.53
2PbBr2Ionized aqueous solution + 2HNO3Ionized aqueous solution
🔥
2PbO2Crystalline solid + Br2Un-ionized aqueous solution + 2NOGas + 2HBrGas
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
454.6322.65443.2
per 1 mol of
227.3161.32221.6
per 1 mol of
227.3161.32221.6
per 1 mol of
227.3161.32221.6
per 1 mol of
454.6322.65443.2
per 1 mol of
227.3161.32221.6
per 1 mol of
227.3161.32221.6

Changes in aqueous solution (2)

Reaction of lead(II) bromide and nitric acid
ΔrG221.63 kJ/mol
K0.15 × 10−38
pK38.83
2PbBr2Ionized aqueous solution + 2HNO3Ionized aqueous solution
🔥
2PbO2Crystalline solid + Br2Un-ionized aqueous solution + 2NOGas + 2HBrIonized 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
284.3221.63210.6
per 1 mol of
142.2110.81105.3
per 1 mol of
142.2110.81105.3
per 1 mol of
142.2110.81105.3
per 1 mol of
284.3221.63210.6
per 1 mol of
142.2110.81105.3
per 1 mol of
142.2110.81105.3

Changes in aqueous solution (3)

Reaction of lead(II) bromide and nitric acid
ΔrG339.2 kJ/mol
K0.38 × 10−59
pK59.43
2PbBr2Un-ionized aqueous solution + 2HNO3Ionized aqueous solution
🔥
2PbO2Crystalline solid + Br2Un-ionized aqueous solution + 2NOGas + 2HBrGas
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
339.2
per 1 mol of
169.6
per 1 mol of
169.6
per 1 mol of
169.6
per 1 mol of
339.2
per 1 mol of
169.6
per 1 mol of
169.6

Changes in aqueous solution (4)

Reaction of lead(II) bromide and nitric acid
ΔrG238.2 kJ/mol
K0.19 × 10−41
pK41.73
2PbBr2Un-ionized aqueous solution + 2HNO3Ionized aqueous solution
🔥
2PbO2Crystalline solid + Br2Un-ionized aqueous solution + 2NOGas + 2HBrIonized 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
238.2
per 1 mol of
119.1
per 1 mol of
119.1
per 1 mol of
119.1
per 1 mol of
238.2
per 1 mol of
119.1
per 1 mol of
119.1

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
PbBr2 (cr)-278.7[1]-261.92[1]161.5[1]80.12[1]
PbBr2 (ai)-244.8[1]-232.34[1]175.3[1]
PbBr2 (ao)-240.6[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, (ao):Un-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
PbO2 (cr)-277.4[1]-217.33[1]68.6[1]64.64[1]
Br2 (cr)
Br2 (l)0[1]0[1]152.231[1]75.689[1]
Br2 (g)30.907[1]3.110[1]245.463[1]36.02[1]
Br2 (ao)-2.59[1]3.93[1]130.5[1]
NO (g)90.25[1]86.55[1]210.761[1]29.844[1]
HBr (g)-36.40[1]-53.45[1]198.695[1]29.142[1]
HBr (ai)-121.55[1]-103.96[1]82.4[1]-141.8[1]
* (cr):Crystalline solid, (l):Liquid, (g):Gas, (ao):Un-ionized aqueous solution, (ai):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)