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Chemical reactions
Zn(OH)2 + Na2O → ZnO + 2NaOH

Zn(OH)₂ + Na₂O → ZnO + 2NaOH

Last updated: June 13, 2022

Reaction of zinc hydroxide and sodium oxide: Zn(OH)₂Zinc hydroxide + Na₂OSodium oxide
⟶
ZnOZinc oxide + 2NaOHSodium hydroxide

The reaction of zinc hydroxide and sodium oxide yields zinc oxide and sodium hydroxide. This reaction is an acid-base reaction and is classified as follows:

Reaction of hydroxide base and dehydrating basic oxide

Table of contents

Reaction data

Reactants

Chemical formula	Name	Coefficient	Type	Type in general equation
Zn(OH)₂	Zinc hydroxide	1	Lewis base	Hydroxide base
Na₂O	Sodium oxide	1	Lewis acid	Dehydrating basic oxide

Products

Chemical formula	Name	Coefficient	Type	Type in general equation
ZnO	Zinc oxide	1	–	Basic oxide
NaOH	Sodium hydroxide	2	Lewis conjugate	Hydroxide base

Thermodynamic changes

Changes in standard condition (1)

Reaction of zinc hydroxide and sodium oxide ◆ Δ_rG −148.02 kJ/mol K 8.55 × 10²⁵ pK −25.93: Zn(OH)₂Crystalline solidγ + Na₂OCrystalline solid
⟶
ZnOCrystalline solid + 2NaOHCrystalline solid

	Standard enthalpy of reaction Δ_rH° kJ · mol⁻¹	Standard Gibbs energy of reaction Δ_rG° kJ · mol⁻¹	Standard entropy of reaction Δ_rS° J · K⁻¹ · mol⁻¹	Standard heat capacity of reaction at constant pressure Δ_rC_p° J · K⁻¹ · mol⁻¹
per 1 mol of Equation	–	−148.02	–	–
per 1 mol of Zinc hydroxide	–	−148.02	–	–
per 1 mol of Sodium oxide	–	−148.02	–	–
per 1 mol of Zinc oxide	–	−148.02	–	–
per 1 mol of Sodium hydroxide	–	−74.010	–	–

Changes in standard condition (2)

Reaction of zinc hydroxide and sodium oxide ◆ Δ_rG −148.31 kJ/mol K 9.61 × 10²⁵ pK −25.98: Zn(OH)₂Crystalline solidβ + Na₂OCrystalline solid
⟶
ZnOCrystalline solid + 2NaOHCrystalline solid

	Standard enthalpy of reaction Δ_rH° kJ · mol⁻¹	Standard Gibbs energy of reaction Δ_rG° kJ · mol⁻¹	Standard entropy of reaction Δ_rS° J · K⁻¹ · mol⁻¹	Standard heat capacity of reaction at constant pressure Δ_rC_p° J · K⁻¹ · mol⁻¹
per 1 mol of Equation	−143.37	−148.31	16.3	–
per 1 mol of Zinc hydroxide	−143.37	−148.31	16.3	–
per 1 mol of Sodium oxide	−143.37	−148.31	16.3	–
per 1 mol of Zinc oxide	−143.37	−148.31	16.3	–
per 1 mol of Sodium hydroxide	−71.685	−74.155	8.15	–

Changes in standard condition (3)

Reaction of zinc hydroxide and sodium oxide ◆ Δ_rG −146.76 kJ/mol K 5.14 × 10²⁵ pK −25.71: Zn(OH)₂Crystalline solidε + Na₂OCrystalline solid
⟶
ZnOCrystalline solid + 2NaOHCrystalline solid

	Standard enthalpy of reaction Δ_rH° kJ · mol⁻¹	Standard Gibbs energy of reaction Δ_rG° kJ · mol⁻¹	Standard entropy of reaction Δ_rS° J · K⁻¹ · mol⁻¹	Standard heat capacity of reaction at constant pressure Δ_rC_p° J · K⁻¹ · mol⁻¹
per 1 mol of Equation	−142.03	−146.76	15.9	17.8
per 1 mol of Zinc hydroxide	−142.03	−146.76	15.9	17.8
per 1 mol of Sodium oxide	−142.03	−146.76	15.9	17.8
per 1 mol of Zinc oxide	−142.03	−146.76	15.9	17.8
per 1 mol of Sodium hydroxide	−71.015	−73.380	7.95	8.90

Changes in standard condition (4)

Reaction of zinc hydroxide and sodium oxide: Zn(OH)₂Crystalline solidprecipitated + Na₂OCrystalline solid
⟶
ZnOCrystalline solid + 2NaOHCrystalline solid

	Standard enthalpy of reaction Δ_rH° kJ · mol⁻¹	Standard Gibbs energy of reaction Δ_rG° kJ · mol⁻¹	Standard entropy of reaction Δ_rS° J · K⁻¹ · mol⁻¹	Standard heat capacity of reaction at constant pressure Δ_rC_p° J · K⁻¹ · mol⁻¹
per 1 mol of Equation	−143.1	–	–	–
per 1 mol of Zinc hydroxide	−143.1	–	–	–
per 1 mol of Sodium oxide	−143.1	–	–	–
per 1 mol of Zinc oxide	−143.1	–	–	–
per 1 mol of Sodium hydroxide	−71.55	–	–	–

Changes in aqueous solution (1)

Reaction of zinc hydroxide and sodium oxide ◆ Δ_rG −258.41 kJ/mol K 1.87 × 10⁴⁵ pK −45.27: Zn(OH)₂Un-ionized aqueous solution + Na₂OCrystalline solid
⟶
ZnOCrystalline solid + 2NaOHIonized aqueous solution

	Standard enthalpy of reaction Δ_rH° kJ · mol⁻¹	Standard Gibbs energy of reaction Δ_rG° kJ · mol⁻¹	Standard entropy of reaction Δ_rS° J · K⁻¹ · mol⁻¹	Standard heat capacity of reaction at constant pressure Δ_rC_p° J · K⁻¹ · mol⁻¹
per 1 mol of Equation	–	−258.41	–	–
per 1 mol of Zinc hydroxide	–	−258.41	–	–
per 1 mol of Sodium oxide	–	−258.41	–	–
per 1 mol of Zinc oxide	–	−258.41	–	–
per 1 mol of Sodium hydroxide	–	−129.21	–	–

Changes in aqueous solution (2)

Reaction of zinc hydroxide and sodium oxide ◆ Δ_rG −227.33 kJ/mol K 6.71 × 10³⁹ pK −39.83: Zn(OH)₂Crystalline solidγ + Na₂OCrystalline solid
⟶
ZnOCrystalline solid + 2NaOHIonized aqueous solution

	Standard enthalpy of reaction Δ_rH° kJ · mol⁻¹	Standard Gibbs energy of reaction Δ_rG° kJ · mol⁻¹	Standard entropy of reaction Δ_rS° J · K⁻¹ · mol⁻¹	Standard heat capacity of reaction at constant pressure Δ_rC_p° J · K⁻¹ · mol⁻¹
per 1 mol of Equation	–	−227.33	–	–
per 1 mol of Zinc hydroxide	–	−227.33	–	–
per 1 mol of Sodium oxide	–	−227.33	–	–
per 1 mol of Zinc oxide	–	−227.33	–	–
per 1 mol of Sodium hydroxide	–	−113.67	–	–

Changes in aqueous solution (3)

Reaction of zinc hydroxide and sodium oxide ◆ Δ_rG −227.62 kJ/mol K 7.54 × 10³⁹ pK −39.88: Zn(OH)₂Crystalline solidβ + Na₂OCrystalline solid
⟶
ZnOCrystalline solid + 2NaOHIonized aqueous solution

	Standard enthalpy of reaction Δ_rH° kJ · mol⁻¹	Standard Gibbs energy of reaction Δ_rG° kJ · mol⁻¹	Standard entropy of reaction Δ_rS° J · K⁻¹ · mol⁻¹	Standard heat capacity of reaction at constant pressure Δ_rC_p° J · K⁻¹ · mol⁻¹
per 1 mol of Equation	−232.38	−227.62	−16.4	–
per 1 mol of Zinc hydroxide	−232.38	−227.62	−16.4	–
per 1 mol of Sodium oxide	−232.38	−227.62	−16.4	–
per 1 mol of Zinc oxide	−232.38	−227.62	−16.4	–
per 1 mol of Sodium hydroxide	−116.19	−113.81	−8.20	–

Changes in aqueous solution (4)

Reaction of zinc hydroxide and sodium oxide ◆ Δ_rG −226.07 kJ/mol K 4.03 × 10³⁹ pK −39.61: Zn(OH)₂Crystalline solidε + Na₂OCrystalline solid
⟶
ZnOCrystalline solid + 2NaOHIonized aqueous solution

	Standard enthalpy of reaction Δ_rH° kJ · mol⁻¹	Standard Gibbs energy of reaction Δ_rG° kJ · mol⁻¹	Standard entropy of reaction Δ_rS° J · K⁻¹ · mol⁻¹	Standard heat capacity of reaction at constant pressure Δ_rC_p° J · K⁻¹ · mol⁻¹
per 1 mol of Equation	−231.04	−226.07	−16.8	−305.5
per 1 mol of Zinc hydroxide	−231.04	−226.07	−16.8	−305.5
per 1 mol of Sodium oxide	−231.04	−226.07	−16.8	−305.5
per 1 mol of Zinc oxide	−231.04	−226.07	−16.8	−305.5
per 1 mol of Sodium hydroxide	−115.52	−113.03	−8.40	−152.8

Changes in aqueous solution (5)

Reaction of zinc hydroxide and sodium oxide: Zn(OH)₂Crystalline solidprecipitated + Na₂OCrystalline solid
⟶
ZnOCrystalline solid + 2NaOHIonized aqueous solution

	Standard enthalpy of reaction Δ_rH° kJ · mol⁻¹	Standard Gibbs energy of reaction Δ_rG° kJ · mol⁻¹	Standard entropy of reaction Δ_rS° J · K⁻¹ · mol⁻¹	Standard heat capacity of reaction at constant pressure Δ_rC_p° J · K⁻¹ · mol⁻¹
per 1 mol of Equation	−232.1	–	–	–
per 1 mol of Zinc hydroxide	−232.1	–	–	–
per 1 mol of Sodium oxide	−232.1	–	–	–
per 1 mol of Zinc oxide	−232.1	–	–	–
per 1 mol of Sodium hydroxide	−116.0	–	–	–

Thermodynamic data of reactants

Chemical formula	Standard enthalpy of formation Δ_fH° kJ · mol⁻¹	Standard Gibbs energy of formation Δ_fG° kJ · mol⁻¹	Standard molar entropy S° J · K⁻¹ · mol⁻¹	Standard molar heat capacity at constant pressure C_p° 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]	–	–
Na₂O (cr)	-414.22^[1]	-375.46^[1]	75.06^[1]	69.12^[1]
Na₂O (g)	-35.6^[1]	-52.3^[1]	261.2^[1]	55.2^[1]

* (cr):Crystalline solid, (ai):Ionized aqueous solution, (ao):Un-ionized aqueous solution, (g):Gas

Thermodynamic data of products

Chemical formula	Standard enthalpy of formation Δ_fH° kJ · mol⁻¹	Standard Gibbs energy of formation Δ_fG° kJ · mol⁻¹	Standard molar entropy S° J · K⁻¹ · mol⁻¹	Standard molar heat capacity at constant pressure C_p° J · K⁻¹ · mol⁻¹
ZnO (cr)	-348.28^[1]	-318.30^[1]	43.64^[1]	40.25^[1]
NaOH (cr)	-425.609^[1]	-379.494^[1]	64.455^[1]	59.54^[1]
NaOH (g)	-207.1^[1]	-210.0^[1]	228.43^[1]	48.37^[1]
NaOH (ai)	-470.114^[1]	-419.150^[1]	48.1^[1]	-102.1^[1]
NaOH (cr) 1 hydrate	-734.543^[1]	-629.338^[1]	99.50^[1]	90.17^[1]
NaOH (l) 2 hydrate	-1019.076^[1]	-873.091^[1]	195.979^[1]	239.41^[1]
NaOH (l) 3.5 hydrate	-1459.798^[1]	-1236.356^[1]	286.089^[1]	354.43^[1]
NaOH (l) 4 hydrate	-1605.15^[1]	-1356.64^[1]	318.70^[1]	–
NaOH (l) 5 hydrate	-1894.31^[1]	-1596.34^[1]	386.06^[1]	–
NaOH (l) 7 hydrate	-2469.02^[1]	-2073.80^[1]	526.31^[1]	–

* (cr):Crystalline solid, (g):Gas, (ai):Ionized aqueous solution, (l):Liquid

References

List of references

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
https://doi.org/10.18434/M32124
National Institute of Standards and Technology (NIST)
Citation list

Δ_rG	−148.02 kJ/mol
K	8.55 × 10²⁵
pK	−25.93

Δ_rG	−148.31 kJ/mol
K	9.61 × 10²⁵
pK	−25.98

Δ_rG	−146.76 kJ/mol
K	5.14 × 10²⁵
pK	−25.71

Δ_rG	−258.41 kJ/mol
K	1.87 × 10⁴⁵
pK	−45.27

Zn(OH)2 + Na2O → ZnO + 2NaOH