You-iggy

7(NH4)2Cr2O7 + 6e → 7(NH4)2CrO4 + Cr + 3Cr2O72−

Reduction of ammonium dichromate
7(NH4)2Cr2O7Ammonium dichromate + 6eElectron
7(NH4)2CrO4Ammonium chromate + CrChromium + 3Cr2O72−Dichromate ion

Reduction of ammonium dichromate yields ammonium chromate, chromium, and dichromate ion (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

Reduction of ammonium dichromate
7(NH4)2Cr2O7Ammonium dichromate + 6eElectron
7(NH4)2CrO4Ammonium chromate + CrChromium + 3Cr2O72−Dichromate ion

General equation

Reduction of reducible species
ReactantOxidizing agent + e
ProductReduction product

Oxidation state of each atom

Reduction of ammonium dichromate

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
(NH4)2Cr2O7Ammonium dichromate7
Oxidizing
eElectron6
Electron

Products

Chemical formulaNameCoefficientTypeType in general
equation
(NH4)2CrO4Ammonium chromate7
CrChromium1
Reduced
Cr2O72−Dichromate ion3

Thermodynamic changes

Changes in standard condition

Reduction of ammonium dichromate
ΔrG108.7 kJ/mol
K0.90 × 10−19
pK19.04
7(NH4)2Cr2O7Ionized aqueous solution + 6e
7(NH4)2CrO4Ionized aqueous solution + CrCrystalline solid + 3Cr2O72−Un-ionized 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
−207.6108.7−672.4
−29.6615.53−96.06
per 1 mol of
Electron
−34.6018.12−112.1
per 1 mol of
−29.6615.53−96.06
per 1 mol of
−207.6108.7−672.4
per 1 mol of
Dichromate ion
−69.2036.23−224.1

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
(NH4)2Cr2O7 (cr)-1806.7[1]
(NH4)2Cr2O7 (ai)-1755.2[1]-1459.5[1]488.7[1]
e
* (cr):Crystalline solid, (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
(NH4)2CrO4 (cr)-1167.3[1]
(NH4)2CrO4 (ai)-1146.16[1]-886.36[1]277.0[1]
Cr (cr)0[1]0[1]23.77[1]23.35[1]
Cr (g)396.6[1]351.8[1]174.50[1]20.79[1]
Cr2O72− (ao)-1490.3[1]-1301.1[1]261.9[1]
* (cr):Crystalline solid, (ai):Ionized aqueous solution, (g):Gas, (ao):Un-ionized aqueous solution

References

List of references

  1. 1