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3HCl + 2KNO2 → HClO3 + N2 + 2KCl + H2O

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Reaction of hydrogen chloride and potassium nitrite
3HClHydrogen chloride + 2KNO2Potassium nitrite
⟶
HClO3Chloric acid + N2Nitrogen + 2KClPotassium chloride + H2OWater

The reaction of hydrogen chloride and potassium nitrite yields chloric acid, nitrogen, potassium chloride, 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 hydrogen chloride and potassium nitrite
3HClHydrogen chloride + 2KNO2Potassium nitrite
⟶
HClO3Chloric acid + N2Nitrogen + 2KClPotassium chloride + H2OWater

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

Reaction of hydrogen chloride and potassium nitrite

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
HClHydrogen chloride3
Reducing
Hardly oxidizable
KNO2Potassium nitrite2
Oxidizing
Oxidizing

Products

Chemical formulaNameCoefficientTypeType in general
equation
HClO3Chloric acid1
Oxidized
–
N2Nitrogen1
Reduced
–
KClPotassium chloride2
–
–
H2OWater1
–
–

Thermodynamic changes

Changes in standard condition

Reaction of hydrogen chloride and potassium nitrite
◆
ΔrG−49.6 kJ/mol
K4.89 × 108
pK−8.69
3HClIonized aqueous solution + 2KNO2Ionized aqueous solution
⟶
HClO3Ionized aqueous solution + N2Gas + 2KClIonized aqueous solution + 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
−13.6−49.6121.3–
per 1 mol of
−4.53−16.540.43–
per 1 mol of
−6.80−24.860.65–
per 1 mol of
−13.6−49.6121.3–
per 1 mol of
−13.6−49.6121.3–
per 1 mol of
−6.80−24.860.65–
per 1 mol of
−13.6−49.6121.3–

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
HCl (g)-92.307[1]-95.299[1]186.908[1]29.12[1]
HCl (ai)-167.159[1]-131.228[1]56.5[1]-136.4[1]
KNO2 (cr)
rhombic
-369.82[1]-306.55[1]152.09[1]107.40[1]
KNO2 (ai)-356.9[1]-315.4[1]225.5[1]–
* (g):Gas, (ai):Ionized aqueous solution, (cr):Crystalline solid

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
HClO3 (ai)-103.97[1]-7.95[1]162.3[1]–
N2 (g)0[1]0[1]191.61[1]29.125[1]
KCl (cr)-436.747[1]-409.14[1]82.59[1]51.30[1]
KCl (g)-214.14[1]-233.0[1]239.10[1]36.48[1]
KCl (ai)-419.53[1]-414.49[1]159.0[1]-114.6[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]
* (ai):Ionized aqueous solution, (g):Gas, (cr):Crystalline solid, (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)