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2HSCN + 3Co(OH)2 → (NH4)2CO3 + 2CoS + CoCO3

The reaction of thiocyanic acid and cobalt(II) hydroxide yields ammonium carbonate, cobalt(II) sulfide, and cobalt(II) carbonate (Other reactions are here). 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 reactions
  5. 5Related categories

Reaction data

Chemical equation

General equation

Reaction of acid and base
AcidBrønsted acid + BaseBrønsted base
SaltConjugate base + (H2O)(Conjugate acid)
Reaction of weak acid and weak base
Weak acidBrønsted acid + Weak baseBrønsted base
Salt of weak acid and weak baseConjugate base + (H2O)(Conjugate acid)

Oxidation state of each atom

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
HSCNThiocyanic acid2
Brønsted acid
Acid
Weak acid
Co(OH)2Cobalt(II) hydroxide3
Brønsted base
Base
Weak base

Products

Chemical formulaNameCoefficientTypeType in general
equation
(NH4)2CO3Ammonium carbonate1
Conjugate base
Salt
Salt of weak acid and weak base
CoSCobalt(II) sulfide2
Conjugate base
Salt
Salt of weak acid and weak base
CoCO3Cobalt(II) carbonate1
Conjugate base
Salt
Salt of weak acid and weak base

Thermodynamic changes

Changes in aqueous solution (1)

Reaction of thiocyanic acid and cobalt(II) hydroxide
2HSCNIonized aqueous solution + 3Co(OH)2Un-ionized aqueous solution
(NH4)2CO3Ionized aqueous solution + 2CoSCrystalline solid + CoCO3Crystalline 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
per 1 mol of
per 1 mol of
per 1 mol of

Changes in aqueous solution (2)

Reaction of thiocyanic acid and cobalt(II) hydroxide
2HSCNIonized aqueous solution + 3Co(OH)2Crystalline solidblue, precipitated
(NH4)2CO3Ionized aqueous solution + 2CoSCrystalline solid + CoCO3Crystalline 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
per 1 mol of
per 1 mol of
per 1 mol of

Changes in aqueous solution (3)

Reaction of thiocyanic acid and cobalt(II) hydroxide
2HSCNIonized aqueous solution + 3Co(OH)2Crystalline solidpink, precipitated
(NH4)2CO3Ionized aqueous solution + 2CoSCrystalline solid + CoCO3Crystalline 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
−354.5
per 1 mol of
−177.3
−118.2
per 1 mol of
−354.5
per 1 mol of
−177.3
−354.5

Changes in aqueous solution (4)

Reaction of thiocyanic acid and cobalt(II) hydroxide
2HSCNIonized aqueous solution + 3Co(OH)2Crystalline solidpink, precipitated, aged
(NH4)2CO3Ionized aqueous solution + 2CoSCrystalline solid + CoCO3Crystalline 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
per 1 mol of
per 1 mol of
per 1 mol of

Changes in aqueous solution (5)

Reaction of thiocyanic acid and cobalt(II) hydroxide
2HSCNUn-ionized aqueous solution + 3Co(OH)2Un-ionized aqueous solution
(NH4)2CO3Ionized aqueous solution + 2CoSCrystalline solid + CoCO3Crystalline 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
per 1 mol of
per 1 mol of
per 1 mol of

Changes in aqueous solution (6)

Reaction of thiocyanic acid and cobalt(II) hydroxide
2HSCNUn-ionized aqueous solution + 3Co(OH)2Crystalline solidblue, precipitated
(NH4)2CO3Ionized aqueous solution + 2CoSCrystalline solid + CoCO3Crystalline 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
per 1 mol of
per 1 mol of
per 1 mol of

Changes in aqueous solution (7)

Reaction of thiocyanic acid and cobalt(II) hydroxide
2HSCNUn-ionized aqueous solution + 3Co(OH)2Crystalline solidpink, precipitated
(NH4)2CO3Ionized aqueous solution + 2CoSCrystalline solid + CoCO3Crystalline 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
per 1 mol of
per 1 mol of
per 1 mol of

Changes in aqueous solution (8)

Reaction of thiocyanic acid and cobalt(II) hydroxide
2HSCNUn-ionized aqueous solution + 3Co(OH)2Crystalline solidpink, precipitated, aged
(NH4)2CO3Ionized aqueous solution + 2CoSCrystalline solid + CoCO3Crystalline 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
per 1 mol of
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
HSCN (ai)76.44[1]92.71[1]144.3[1]-40.2[1]
HSCN (ao)97.56[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]
* (ai):Ionized aqueous solution, (ao):Un-ionized aqueous solution, (cr):Crystalline solid

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)2CO3 (ai)-942.15[1]-686.42[1]169.9[1]
CoS (cr)-82.8[1]
CoCO3 (cr)-713.0[1]
* (ai):Ionized aqueous solution, (cr):Crystalline solid

References

List of references

  1. 1