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CoCO3 + 2KOH → K2CO3 + Co(OH)2

The reaction of cobalt(II) carbonate and potassium hydroxide yields potassium carbonate 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
CoCO3Cobalt(II) carbonate1
Brønsted acid
Salt of weak base
KOHPotassium hydroxide2
Brønsted base
Strong base

Products

Chemical formulaNameCoefficientTypeType in general
equation
K2CO3Potassium carbonate1
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) carbonate and potassium hydroxide
CoCO3Crystalline solid + 2KOHCrystalline solid
K2CO3Crystalline 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

Changes in standard condition (2)

Reaction of cobalt(II) carbonate and potassium hydroxide
CoCO3Crystalline solid + 2KOHCrystalline solid
K2CO3Crystalline 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
−128.2
−128.2
−64.10
−128.2
−128.2

Changes in standard condition (3)

Reaction of cobalt(II) carbonate and potassium hydroxide
CoCO3Crystalline solid + 2KOHCrystalline solid
K2CO3Crystalline 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

Changes in aqueous solution (1)

Reaction of cobalt(II) carbonate and potassium hydroxide
CoCO3Crystalline solid + 2KOHIonized aqueous solution
K2CO3Ionized aqueous solution + 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

Changes in aqueous solution (2)

Reaction of cobalt(II) carbonate and potassium hydroxide
CoCO3Crystalline solid + 2KOHIonized aqueous solution
K2CO3Ionized aqueous solution + 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

Changes in aqueous solution (3)

Reaction of cobalt(II) carbonate and potassium hydroxide
CoCO3Crystalline solid + 2KOHIonized aqueous solution
K2CO3Ionized aqueous solution + 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
−43.9
−43.9
−21.9
−43.9
−43.9

Changes in aqueous solution (4)

Reaction of cobalt(II) carbonate and potassium hydroxide
CoCO3Crystalline solid + 2KOHIonized aqueous solution
K2CO3Ionized aqueous solution + 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

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
CoCO3 (cr)-713.0[1]
KOH (cr)-424.764[1]-379.08[1]78.9[1]64.9[1]
KOH (g)-231.0[1]-232.6[1]238.3[1]49.20[1]
KOH (ai)-482.37[1]-440.50[1]91.6[1]-126.8[1]
KOH (cr)
1 hydrate
-748.9[1]-645.1[1]117.2[1]
KOH (cr)
2 hydrate
-1051.0[1]-887.3[1]150.6[1]
* (cr):Crystalline 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
K2CO3 (cr)-1151.02[1]-1063.5[1]155.52[1]114.43[1]
K2CO3 (ai)-1181.90[1]-1094.36[1]148.1[1]
K2CO3 (cr)
1.5 hydrate
-1609.2[1]-1432.5[1]203.3[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