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CaCr2O7 + SeO2 💧→ CaSeO3↓ + 2CrO3

The reaction of calcium dichromate and selenium dioxide yields calcium selenite and chromium(VI) oxide. This reaction is an acid-base reaction and is classified as follows:

Table of contents
  1. 1Reaction data
  2. 2Thermodynamic changes
  3. 3References
  4. 4Related categories

Reaction data

Chemical equation

General equation

Oxidation state of each atom

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
CaCr2O7Calcium dichromate1
Lewis acid
Very soluble in water
SeO2Selenium dioxide1
Lewis base
Very soluble in water

Products

Chemical formulaNameCoefficientTypeType in general
equation
CaSeO3Calcium selenite1
Lewis conjugate
Very slightly soluble in water
CrO3Chromium(VI) oxide2
Non-redox product

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
CaCr2O7
SeO2 (cr)-225.35[1]
SeO2 (aq)-221.63[1]
* (cr):Crystalline solid, (aq):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
CaSeO3 (cr)
2 hydrate
-1428.7[1]
CaSeO3 (cr)
2 hydrate
precipitated
-1610.4[1]
CrO3 (cr)-589.5[1]
CrO3 (g)-385.8[1]
* (cr):Crystalline solid, (g):Gas

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)