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2Na + CuS → Na2S + Cu

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Reaction of sodium and copper(II) sulfide
2NaSodium + CuSCopper(II) sulfide
⟶
Na2SSodium sulfide + CuCopper

The reaction of sodium and copper(II) sulfide yields sodium sulfide and copper (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 sodium and copper(II) sulfide
2NaSodium + CuSCopper(II) sulfide
⟶
Na2SSodium sulfide + CuCopper

General equation

Reaction of reducing species and reducible species
Reducing speciesReducing agent + Reducible speciesOxidizing agent
⟶
ProductOxidation product + ProductReduction product

Oxidation state of each atom

Reaction of sodium and copper(II) sulfide

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
NaSodium2
Reducing
Reducing
CuSCopper(II) sulfide1
Oxidizing
Reducible

Products

Chemical formulaNameCoefficientTypeType in general
equation
Na2SSodium sulfide1
Oxidized
–
CuCopper1
Reduced
–

Thermodynamic changes

Changes in standard condition

Reaction of sodium and copper(II) sulfide
◆
ΔrG−296.2 kJ/mol
K7.80 × 1051
pK−51.89
2NaCrystalline solid + CuSCrystalline solid
⟶
Na2SCrystalline solid + CuCrystalline solid
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
−311.7−296.2−52.1–
per 1 mol of
−155.8−148.1−26.1–
per 1 mol of
−311.7−296.2−52.1–
per 1 mol of
−311.7−296.2−52.1–
per 1 mol of
−311.7−296.2−52.1–

Changes in aqueous solution

Reaction of sodium and copper(II) sulfide
◆
ΔrG−384.5 kJ/mol
K2.30 × 1067
pK−67.36
2NaCrystalline solid + CuSCrystalline solid
⟶
Na2SIonized aqueous solution + CuCrystalline solid
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
−394.2−384.5−32.5–
per 1 mol of
−197.1−192.3−16.3–
per 1 mol of
−394.2−384.5−32.5–
per 1 mol of
−394.2−384.5−32.5–
per 1 mol of
−394.2−384.5−32.5–

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
Na (cr)0[1]0[1]51.21[1]28.24[1]
Na (g)107.32[1]76.761[1]153.712[1]20.786[1]
CuS (cr)-53.1[1]-53.6[1]66.5[1]47.82[1]
* (cr):Crystalline solid, (g):Gas

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
Na2S (cr)-364.8[1]-349.8[1]83.7[1]–
Na2S (ai)-447.3[1]-438.1[1]103.3[1]–
Na2S (cr)
4.5 hydrate
-1725.9[1]–––
Na2S (cr)
5 hydrate
-1886.6[1]–––
Na2S (cr)
9 hydrate
-3074.0[1]–––
Cu (cr)0[1]0[1]33.150[1]24.435[1]
Cu (g)338.32[1]298.58[1]166.38[1]20.786[1]
* (cr):Crystalline solid, (ai):Ionized aqueous solution, (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)