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3Zn(OH)2 + As2O5 → Zn3(AsO4)2 + 3H2O

The reaction of zinc hydroxide and diarsenic pentaoxide yields zinc arsenate and water. 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

Reaction of base and acidic oxide
BaseLewis base + Acidic oxideLewis acid + H2O
Oxoacid saltLewis conjugate + (H2O)

Oxidation state of each atom

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
Zn(OH)2Zinc hydroxide3
Lewis base
Base
Hydroxide base
Weak hydroxide base
As2O5Diarsenic pentaoxide1
Lewis acid
Acidic oxide
Weakly acidic oxide

Products

Chemical formulaNameCoefficientTypeType in general
equation
Zn3(AsO4)2Zinc arsenate1
Lewis conjugate
Oxoacid salt
Salt of weak acid and weak base
H2OWater3
Water

Thermodynamic changes

Changes in standard condition (1)

Reaction of zinc hydroxide and diarsenic pentaoxide
ΔrG−163 kJ/mol
K3.60 × 1028
pK−28.56
3Zn(OH)2Crystalline solidγ + As2O5Crystalline solid
Zn3(AsO4)2Crystalline solid + 3H2OLiquid
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
−163
per 1 mol of
−54.3
−163
per 1 mol of
−163
per 1 mol of
−54.3

Changes in standard condition (2)

Reaction of zinc hydroxide and diarsenic pentaoxide
ΔrG−164 kJ/mol
K5.39 × 1028
pK−28.73
3Zn(OH)2Crystalline solidβ + As2O5Crystalline solid
Zn3(AsO4)2Crystalline solid + 3H2OLiquid
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
−164
per 1 mol of
−54.7
−164
per 1 mol of
−164
per 1 mol of
−54.7

Changes in standard condition (3)

Reaction of zinc hydroxide and diarsenic pentaoxide
ΔrG−159 kJ/mol
K7.17 × 1027
pK−27.86
3Zn(OH)2Crystalline solidε + As2O5Crystalline solid
Zn3(AsO4)2Crystalline solid + 3H2OLiquid
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
−159
per 1 mol of
−53.0
−159
per 1 mol of
−159
per 1 mol of
−53.0

Changes in standard condition (4)

Reaction of zinc hydroxide and diarsenic pentaoxide
3Zn(OH)2Crystalline solidprecipitated + As2O5Crystalline solid
Zn3(AsO4)2Crystalline solid + 3H2OLiquid
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 (1)

Reaction of zinc hydroxide and diarsenic pentaoxide
3Zn(OH)2Un-ionized aqueous solution + As2O5Aqueous solution
Zn3(AsO4)2Crystalline solid + 3H2OLiquid
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 zinc hydroxide and diarsenic pentaoxide
3Zn(OH)2Crystalline solidγ + As2O5Aqueous solution
Zn3(AsO4)2Crystalline solid + 3H2OLiquid
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 zinc hydroxide and diarsenic pentaoxide
3Zn(OH)2Crystalline solidβ + As2O5Aqueous solution
Zn3(AsO4)2Crystalline solid + 3H2OLiquid
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 (4)

Reaction of zinc hydroxide and diarsenic pentaoxide
3Zn(OH)2Crystalline solidε + As2O5Aqueous solution
Zn3(AsO4)2Crystalline solid + 3H2OLiquid
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 zinc hydroxide and diarsenic pentaoxide
3Zn(OH)2Crystalline solidprecipitated + As2O5Aqueous solution
Zn3(AsO4)2Crystalline solid + 3H2OLiquid
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
Zn(OH)2 (cr)
γ
-553.81[1]
Zn(OH)2 (cr)
β
-641.91[1]-553.52[1]81.2[1]
Zn(OH)2 (cr)
ε
-643.25[1]-555.07[1]81.6[1]72.4[1]
Zn(OH)2 (cr)
precipitated
-642.2[1]
Zn(OH)2 (ai)-613.88[1]-461.56[1]-133.5[1]-251[1]
Zn(OH)2 (ao)-522.73[1]
As2O5 (cr)-924.87[1]-782.3[1]105.4[1]116.52[1]
As2O5 (aq)-951.4[1]
As2O5 (cr)
4 hydrate
-2104.6[1]
* (cr):Crystalline solid, (ai):Ionized aqueous solution, (ao):Un-ionized aqueous solution, (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
Zn3(AsO4)2 (cr)-1895[1]
H2O (cr)
H2O (l)-285.830[1]-237.129[1]69.91[1]75.291[1]
H2O (g)-241.818[1]-228.572[1]188.825[1]33.577[1]
* (cr):Crystalline solid, (l):Liquid, (g):Gas

References

List of references

  1. 1