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  3. 42FeI2 + 6HNO3 + 45H^+ ๐Ÿ”ฅโ†’ 28FeI3 + 14Fe^3+ + 3N2H5^+ + 18H2O

42FeI2 + 6HNO3 + 45H+ ๐Ÿ”ฅโ†’ 28FeI3 + 14Fe3+ + 3N2H5+ + 18H2O

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Reaction of iron(II) iodide and nitric acid under acidic condition
42FeI2Iron(II) iodide + 6HNO3Nitric acid + 45H+Hydrogen ion
๐Ÿ”ฅ
โŸถ
28FeI3Iron(III) iodide + 14Fe3+Iron(III) ion + 3N2H5+Hydrazinium ion + 18H2OWater

The reaction of iron(II) iodide, nitric acid, and hydrogen ion yields iron(III) iodide, iron(III) ion, hydrazinium 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 iron(II) iodide and nitric acid under acidic condition
42FeI2Iron(II) iodide + 6HNO3Nitric acid + 45H+Hydrogen ion
๐Ÿ”ฅ
โŸถ
28FeI3Iron(III) iodide + 14Fe3+Iron(III) ion + 3N2H5+Hydrazinium ion + 18H2OWater

General equation

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

Oxidation state of each atom

Reaction of iron(II) iodide and nitric acid under acidic condition

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
FeI2Iron(II) iodide42
Reducing
Oxidizable
HNO3Nitric acid6
Oxidizing
Oxidizing under acidic condition
H+Hydrogen ion45
โ€“
Hydrogen ion

Products

Chemical formulaNameCoefficientTypeType in general
equation
FeI3Iron(III) iodide28
Oxidized
โ€“
Fe3+Iron(III) ion14
Oxidized
โ€“
N2H5+Hydrazinium ion3
Reduced
โ€“
H2OWater18
โ€“
Water

Thermodynamic changes

Changes in aqueous solution

Reaction of iron(II) iodide and nitric acid under acidic condition
โ—†
ฮ”rGโˆ’236.2 kJ/mol
K2.40 ร— 1041
pKโˆ’41.38
42FeI2Ionized aqueous solution + 6HNO3Ionized aqueous solution + 45H+Un-ionized aqueous solution
๐Ÿ”ฅ
โŸถ
28FeI3Ionized aqueous solution + 14Fe3+Un-ionized aqueous solution + 3N2H5+Un-ionized aqueous solution + 18H2OLiquid
Standard enthalpy
of reaction
ฮ”rHยฐ
kJ ยท molโˆ’1		Standard
Gibbs energy
of reaction
ฮ”rGยฐ
kJ ยท molโˆ’1		Standard entropy
of reaction
ฮ”rSยฐ
J ยท Kโˆ’1 ยท molโˆ’1		Standard heat
capacity of reaction
at constant pressure
ฮ”rCpยฐ
J ยท Kโˆ’1 ยท molโˆ’1
per 1 mol of
Equation
โˆ’2216.7โˆ’236.2โˆ’6651โ€“
per 1 mol of
โˆ’52.779โˆ’5.624โˆ’158.4โ€“
per 1 mol of
โˆ’369.45โˆ’39.37โˆ’1109โ€“
per 1 mol of
Hydrogen ion
โˆ’49.260โˆ’5.249โˆ’147.8โ€“
per 1 mol of
โˆ’79.168โˆ’8.436โˆ’237.5โ€“
per 1 mol of
Iron(III) ion
โˆ’158.34โˆ’16.87โˆ’475.1โ€“
per 1 mol of
Hydrazinium ion
โˆ’738.90โˆ’78.73โˆ’2217โ€“
per 1 mol of
โˆ’123.15โˆ’13.12โˆ’369.5โ€“

Thermodynamic data of reactants

Chemical formulaStandard enthalpy
of formation
ฮ”fHยฐ
kJ ยท molโˆ’1		Standard Gibbs
energy of
formation
ฮ”fGยฐ
kJ ยท molโˆ’1		Standard
molar entropy
Sยฐ
J ยท Kโˆ’1 ยท molโˆ’1		Standard molar
heat capacity at
constant pressure
Cpยฐ
J ยท Kโˆ’1 ยท molโˆ’1
FeI2 (cr)-113.0[1]โ€“โ€“โ€“
FeI2 (g)60.7[1]โ€“โ€“โ€“
FeI2 (ai)-199.6[1]-182.05[1]84.9[1]โ€“
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]
H+ (g)1536.202[1]โ€“โ€“โ€“
H+ (ao)0[1]0[1]0[1]0[1]
* (cr):Crystalline solid, (g):Gas, (ai):Ionized aqueous solution, (l):Liquid, (ao):Un-ionized aqueous solution

Thermodynamic data of products

Chemical formulaStandard enthalpy
of formation
ฮ”fHยฐ
kJ ยท molโˆ’1		Standard Gibbs
energy of
formation
ฮ”fGยฐ
kJ ยท molโˆ’1		Standard
molar entropy
Sยฐ
J ยท Kโˆ’1 ยท molโˆ’1		Standard molar
heat capacity at
constant pressure
Cpยฐ
J ยท Kโˆ’1 ยท molโˆ’1
FeI3 (g)71[1]โ€“โ€“โ€“
FeI3 (ai)-214.2[1]-159.4[1]18.0[1]โ€“
Fe3+ (g)5712.8[1]โ€“โ€“โ€“
Fe3+ (ao)-48.5[1]-4.7[1]-315.9[1]โ€“
N2H5+ (ao)-7.5[1]82.5[1]151[1]70.3[1]
H2O (cr)โ€“โ€“โ€“โ€“
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, (ai):Ionized aqueous solution, (ao):Un-ionized aqueous solution, (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)