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18KI + 8Cr(NO3)3 + 24H+ → 18KNO3 + 9I2 + 6NO↑ + 8Cr3+ + 12H2O

Reaction of potassium iodide and chromium(III) nitrate under acidic condition
18KIPotassium iodide + 8Cr(NO3)3Chromium(III) nitrate + 24H+Hydrogen ion
18KNO3Potassium nitrate + 9I2Iodine + 6NONitrogen monoxide + 8Cr3+Chromium(III) ion + 12H2OWater

The reaction of potassium iodide, chromium(III) nitrate, and hydrogen ion yields potassium nitrate, iodine, nitrogen monoxide, chromium(III) ion, 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 potassium iodide and chromium(III) nitrate under acidic condition
18KIPotassium iodide + 8Cr(NO3)3Chromium(III) nitrate + 24H+Hydrogen ion
18KNO3Potassium nitrate + 9I2Iodine + 6NONitrogen monoxide + 8Cr3+Chromium(III) ion + 12H2OWater

General equation

Reaction of oxidizable species and oxidizing species under acidic condition
Oxidizable speciesReducing agent + Oxidizing speciesOxidizing agent + H+Non-redox agent
ProductOxidation product + ProductReduction product + H2ONon-redox product

Oxidation state of each atom

Reaction of potassium iodide and chromium(III) nitrate under acidic condition

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
KIPotassium iodide18
Reducing
Oxidizable
Cr(NO3)3Chromium(III) nitrate8
Oxidizing
Oxidizing under acidic condition
H+Hydrogen ion24
Hydrogen ion

Products

Chemical formulaNameCoefficientTypeType in general
equation
KNO3Potassium nitrate18
I2Iodine9
Oxidized
NONitrogen monoxide6
Reduced
Cr3+Chromium(III) ion8
H2OWater12
Water

Thermodynamic changes

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
KI (cr)-327.900[1]-324.892[1]106.32[1]52.93[1]
KI (g)-125.5[1]-166.1[1]258.3[1]37.11[1]
KI (ai)-307.57[1]-334.85[1]213.8[1]-120.5[1]
Cr(NO3)3 (cr)
9 hydrate
456.9[1]
H+ (g)1536.202[1]
H+ (ao)0[1]0[1]0[1]0[1]
* (cr):Crystalline solid, (g):Gas, (ai):Ionized aqueous solution, (ao):Un-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
KNO3 (cr)-494.63[1]-394.86[1]133.05[1]96.40[1]
KNO3 (ai)-459.74[1]-394.53[1]248.9[1]-64.9[1]
I2 (cr)0[1]0[1]116.135[1]54.438[1]
I2 (g)62.438[1]19.327[1]260.69[1]36.90[1]
I2 (ao)22.6[1]16.40[1]137.2[1]
NO (g)90.25[1]86.55[1]210.761[1]29.844[1]
Cr3+ (g)5648.4[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]
* (cr):Crystalline solid, (ai):Ionized aqueous solution, (g):Gas, (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)