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CoS + Mg(OH)2 → MgS + Co(OH)2

The reaction of cobalt(II) sulfide and magnesium hydroxide yields magnesium sulfide and cobalt(II) hydroxide. 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
CoSCobalt(II) sulfide1
Brønsted acid
Salt of weak base
Mg(OH)2Magnesium hydroxide1
Brønsted base
Strong base

Products

Chemical formulaNameCoefficientTypeType in general
equation
MgSMagnesium sulfide1
Conjugate acid
Salt of strong base
Co(OH)2Cobalt(II) hydroxide1
Conjugate base
Weak base

Thermodynamic changes

Changes in standard condition (1)

Reaction of cobalt(II) sulfide and magnesium hydroxide
CoSCrystalline solid + Mg(OH)2Crystalline solid
MgSCrystalline solid + Co(OH)2Crystalline solidblue, precipitated
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
per 1 mol of
per 1 mol of

Changes in standard condition (2)

Reaction of cobalt(II) sulfide and magnesium hydroxide
CoSCrystalline solid + Mg(OH)2Crystalline solid
MgSCrystalline solid + Co(OH)2Crystalline solidpink, precipitated
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
121.6
per 1 mol of
121.6
121.6
per 1 mol of
121.6
121.6

Changes in standard condition (3)

Reaction of cobalt(II) sulfide and magnesium hydroxide
CoSCrystalline solid + Mg(OH)2Crystalline solid
MgSCrystalline solid + Co(OH)2Crystalline solidpink, precipitated, aged
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
per 1 mol of
per 1 mol of

Changes in standard condition (4)

Reaction of cobalt(II) sulfide and magnesium hydroxide
CoSCrystalline solid + Mg(OH)2Amorphous solidprecipitated
MgSCrystalline solid + Co(OH)2Crystalline solidblue, precipitated
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
per 1 mol of
per 1 mol of

Changes in standard condition (5)

Reaction of cobalt(II) sulfide and magnesium hydroxide
CoSCrystalline solid + Mg(OH)2Amorphous solidprecipitated
MgSCrystalline solid + Co(OH)2Crystalline solidpink, precipitated
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
117.6
per 1 mol of
117.6
117.6
per 1 mol of
117.6
117.6

Changes in standard condition (6)

Reaction of cobalt(II) sulfide and magnesium hydroxide
CoSCrystalline solid + Mg(OH)2Amorphous solidprecipitated
MgSCrystalline solid + Co(OH)2Crystalline solidpink, precipitated, aged
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
per 1 mol of
per 1 mol of

Changes in aqueous solution (1)

Reaction of cobalt(II) sulfide and magnesium hydroxide
CoSCrystalline solid + Mg(OH)2Crystalline solid
MgSCrystalline solid + Co(OH)2Un-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
per 1 mol of
per 1 mol of

Changes in aqueous solution (2)

Reaction of cobalt(II) sulfide and magnesium hydroxide
CoSCrystalline solid + Mg(OH)2Crystalline solid
MgSCrystalline solid + Co(OH)2Crystalline solidblue, precipitated
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
per 1 mol of
per 1 mol of

Changes in aqueous solution (3)

Reaction of cobalt(II) sulfide and magnesium hydroxide
CoSCrystalline solid + Mg(OH)2Crystalline solid
MgSCrystalline solid + Co(OH)2Crystalline solidpink, precipitated
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
121.6
per 1 mol of
121.6
121.6
per 1 mol of
121.6
121.6

Changes in aqueous solution (4)

Reaction of cobalt(II) sulfide and magnesium hydroxide
CoSCrystalline solid + Mg(OH)2Crystalline solid
MgSCrystalline solid + Co(OH)2Crystalline solidpink, precipitated, aged
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
per 1 mol of
per 1 mol of

Changes in aqueous solution (5)

Reaction of cobalt(II) sulfide and magnesium hydroxide
CoSCrystalline solid + Mg(OH)2Amorphous solidprecipitated
MgSCrystalline solid + Co(OH)2Un-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
per 1 mol of
per 1 mol of

Changes in aqueous solution (6)

Reaction of cobalt(II) sulfide and magnesium hydroxide
CoSCrystalline solid + Mg(OH)2Amorphous solidprecipitated
MgSCrystalline solid + Co(OH)2Crystalline solidblue, precipitated
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
per 1 mol of
per 1 mol of

Changes in aqueous solution (7)

Reaction of cobalt(II) sulfide and magnesium hydroxide
CoSCrystalline solid + Mg(OH)2Amorphous solidprecipitated
MgSCrystalline solid + Co(OH)2Crystalline solidpink, precipitated
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
117.6
per 1 mol of
117.6
117.6
per 1 mol of
117.6
117.6

Changes in aqueous solution (8)

Reaction of cobalt(II) sulfide and magnesium hydroxide
CoSCrystalline solid + Mg(OH)2Amorphous solidprecipitated
MgSCrystalline solid + Co(OH)2Crystalline solidpink, precipitated, aged
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
per 1 mol of
per 1 mol of

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
CoS (cr)-82.8[1]
Mg(OH)2 (cr)-924.54[1]-833.51[1]63.18[1]77.03[1]
Mg(OH)2 (am)
precipitated
-920.5[1]
Mg(OH)2 (g)-561[1]
Mg(OH)2 (ai)-926.84[1]-769.4[1]-159.4[1]
* (cr):Crystalline solid, (am):Amorphous solid, (g):Gas, (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
MgS (cr)-346.0[1]-341.8[1]50.33[1]45.56[1]
Co(OH)2 (cr)
blue, precipitated
-450.1[1]
Co(OH)2 (cr)
pink, precipitated
-539.7[1]-454.3[1]79[1]
Co(OH)2 (cr)
pink, precipitated, aged
-458.1[1]
Co(OH)2 (ai)-518.0[1]-369.0[1]-134[1]
Co(OH)2 (ao)-421.7[1]
* (cr):Crystalline solid, (ai):Ionized aqueous solution, (ao):Un-ionized aqueous solution

References

List of references

  1. 1