Home
Chemical reactions
3ZnSO4 + 3Na2HPO4 💧→ Zn3(PO4)2↓ + 3Na2SO4 + H3PO4

3ZnSO₄ + 3Na₂HPO₄ 💧→ Zn₃(PO₄)₂↓ + 3Na₂SO₄ + H₃PO₄

Last updated: June 13, 2022

Reaction of zinc sulfate and sodium hydrogenphosphate: 3ZnSO₄Zinc sulfate + 3Na₂HPO₄Sodium hydrogenphosphate
💧
⟶
Zn₃(PO₄)₂↓Zinc phosphate + 3Na₂SO₄Sodium sulfate + H₃PO₄Phosphoric acid

The reaction of zinc sulfate and sodium hydrogenphosphate yields zinc phosphate, sodium sulfate, and phosphoric acid (Other reactions are here). This reaction is an acid-base reaction and is classified as follows:

Precipitation reaction

Table of contents

Reaction data

Reactants

Chemical formula	Name	Coefficient	Type	Type in general equation
ZnSO₄	Zinc sulfate	3	Lewis acid	Very soluble in water
Na₂HPO₄	Sodium hydrogenphosphate	3	Lewis base	Soluble in water

Products

Chemical formula	Name	Coefficient	Type	Type in general equation
Zn₃(PO₄)₂	Zinc phosphate	1	Lewis conjugate	Insoluble in water
Na₂SO₄	Sodium sulfate	3	Non-redox product	–
H₃PO₄	Phosphoric acid	1	Non-redox product	–

Thermodynamic changes

Changes in standard condition (1)

Reaction of zinc sulfate and sodium hydrogenphosphate: 3ZnSO₄Crystalline solid + 3Na₂HPO₄Crystalline solid
💧
⟶
Zn₃(PO₄)₂↓Crystalline solid + 3Na₂SO₄Crystalline solidorthorhombic + H₃PO₄Crystalline 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	−139.9	–	–	–
per 1 mol of Zinc sulfate	−46.63	–	–	–
per 1 mol of Sodium hydrogenphosphate	−46.63	–	–	–
per 1 mol of Zinc phosphate	−139.9	–	–	–
per 1 mol of Sodium sulfate	−46.63	–	–	–
per 1 mol of Phosphoric acid	−139.9	–	–	–

Changes in standard condition (2)

Reaction of zinc sulfate and sodium hydrogenphosphate: 3ZnSO₄Crystalline solid + 3Na₂HPO₄Crystalline solid
💧
⟶
Zn₃(PO₄)₂↓Crystalline solid + 3Na₂SO₄Crystalline solidmetastable + H₃PO₄Crystalline 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	–	–	–	–
per 1 mol of Zinc sulfate	–	–	–	–
per 1 mol of Sodium hydrogenphosphate	–	–	–	–
per 1 mol of Zinc phosphate	–	–	–	–
per 1 mol of Sodium sulfate	–	–	–	–
per 1 mol of Phosphoric acid	–	–	–	–

Changes in aqueous solution (1)

Reaction of zinc sulfate and sodium hydrogenphosphate: 3ZnSO₄Un-ionized aqueous solution + 3Na₂HPO₄Ionized aqueous solution
💧
⟶
Zn₃(PO₄)₂↓Crystalline solid + 3Na₂SO₄Ionized aqueous solution + H₃PO₄Un-ionized 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	111.0	–	–	–
per 1 mol of Zinc sulfate	37.00	–	–	–
per 1 mol of Sodium hydrogenphosphate	37.00	–	–	–
per 1 mol of Zinc phosphate	111.0	–	–	–
per 1 mol of Sodium sulfate	37.00	–	–	–
per 1 mol of Phosphoric acid	111.0	–	–	–

Changes in aqueous solution (2)

Reaction of zinc sulfate and sodium hydrogenphosphate: 3ZnSO₄Un-ionized aqueous solution + 3Na₂HPO₄Ionized aqueous solution
💧
⟶
Zn₃(PO₄)₂↓Crystalline solid + 3Na₂SO₄Ionized aqueous solution + H₃PO₄Un-ionized 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	111.0	–	–	–
per 1 mol of Zinc sulfate	37.00	–	–	–
per 1 mol of Sodium hydrogenphosphate	37.00	–	–	–
per 1 mol of Zinc phosphate	111.0	–	–	–
per 1 mol of Sodium sulfate	37.00	–	–	–
per 1 mol of Phosphoric acid	111.0	–	–	–

Changes in aqueous solution (3)

Reaction of zinc sulfate and sodium hydrogenphosphate: 3ZnSO₄Ionized aqueous solution + 3Na₂HPO₄Ionized aqueous solution
💧
⟶
Zn₃(PO₄)₂↓Crystalline solid + 3Na₂SO₄Ionized aqueous solution + H₃PO₄Un-ionized 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	157.3	–	–	–
per 1 mol of Zinc sulfate	52.43	–	–	–
per 1 mol of Sodium hydrogenphosphate	52.43	–	–	–
per 1 mol of Zinc phosphate	157.3	–	–	–
per 1 mol of Sodium sulfate	52.43	–	–	–
per 1 mol of Phosphoric acid	157.3	–	–	–

Changes in aqueous solution (4)

Reaction of zinc sulfate and sodium hydrogenphosphate: 3ZnSO₄Ionized aqueous solution + 3Na₂HPO₄Ionized aqueous solution
💧
⟶
Zn₃(PO₄)₂↓Crystalline solid + 3Na₂SO₄Ionized aqueous solution + H₃PO₄Un-ionized 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	157.3	–	–	–
per 1 mol of Zinc sulfate	52.43	–	–	–
per 1 mol of Sodium hydrogenphosphate	52.43	–	–	–
per 1 mol of Zinc phosphate	157.3	–	–	–
per 1 mol of Sodium sulfate	52.43	–	–	–
per 1 mol of Phosphoric acid	157.3	–	–	–

Changes in aqueous solution (5)

Reaction of zinc sulfate and sodium hydrogenphosphate: 3ZnSO₄Un-ionized aqueous solution + 3Na₂HPO₄Ionized aqueous solution
💧
⟶
Zn₃(PO₄)₂↓Crystalline solid + 3Na₂SO₄Ionized aqueous solution + H₃PO₄Un-ionized 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	111.0	–	–	–
per 1 mol of Zinc sulfate	37.00	–	–	–
per 1 mol of Sodium hydrogenphosphate	37.00	–	–	–
per 1 mol of Zinc phosphate	111.0	–	–	–
per 1 mol of Sodium sulfate	37.00	–	–	–
per 1 mol of Phosphoric acid	111.0	–	–	–

Changes in aqueous solution (6)

Reaction of zinc sulfate and sodium hydrogenphosphate: 3ZnSO₄Un-ionized aqueous solution + 3Na₂HPO₄Ionized aqueous solution
💧
⟶
Zn₃(PO₄)₂↓Crystalline solid + 3Na₂SO₄Ionized aqueous solution + H₃PO₄Un-ionized 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	111.0	–	–	–
per 1 mol of Zinc sulfate	37.00	–	–	–
per 1 mol of Sodium hydrogenphosphate	37.00	–	–	–
per 1 mol of Zinc phosphate	111.0	–	–	–
per 1 mol of Sodium sulfate	37.00	–	–	–
per 1 mol of Phosphoric acid	111.0	–	–	–

Changes in aqueous solution (7)

Reaction of zinc sulfate and sodium hydrogenphosphate: 3ZnSO₄Un-ionized aqueous solution + 3Na₂HPO₄Ionized aqueous solution
💧
⟶
Zn₃(PO₄)₂↓Crystalline solid + 3Na₂SO₄Ionized aqueous solution + H₃PO₄Ionized 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	121.9	–	–	–
per 1 mol of Zinc sulfate	40.63	–	–	–
per 1 mol of Sodium hydrogenphosphate	40.63	–	–	–
per 1 mol of Zinc phosphate	121.9	–	–	–
per 1 mol of Sodium sulfate	40.63	–	–	–
per 1 mol of Phosphoric acid	121.9	–	–	–

Changes in aqueous solution (8)

Reaction of zinc sulfate and sodium hydrogenphosphate: 3ZnSO₄Ionized aqueous solution + 3Na₂HPO₄Ionized aqueous solution
💧
⟶
Zn₃(PO₄)₂↓Crystalline solid + 3Na₂SO₄Ionized aqueous solution + H₃PO₄Ionized 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	168.3	–	–	–
per 1 mol of Zinc sulfate	56.10	–	–	–
per 1 mol of Sodium hydrogenphosphate	56.10	–	–	–
per 1 mol of Zinc phosphate	168.3	–	–	–
per 1 mol of Sodium sulfate	56.10	–	–	–
per 1 mol of Phosphoric acid	168.3	–	–	–

Changes in aqueous solution (9)

Reaction of zinc sulfate and sodium hydrogenphosphate: 3ZnSO₄Un-ionized aqueous solution + 3Na₂HPO₄Ionized aqueous solution
💧
⟶
Zn₃(PO₄)₂↓Crystalline solid + 3Na₂SO₄Ionized aqueous solution + H₃PO₄Ionized 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	121.9	–	–	–
per 1 mol of Zinc sulfate	40.63	–	–	–
per 1 mol of Sodium hydrogenphosphate	40.63	–	–	–
per 1 mol of Zinc phosphate	121.9	–	–	–
per 1 mol of Sodium sulfate	40.63	–	–	–
per 1 mol of Phosphoric acid	121.9	–	–	–

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
ZnSO₄ (cr)	-982.8^[1]	-871.5^[1]	110.5^[1]	99.2^[1]
ZnSO₄ (ai)	-1063.15^[1]	-891.59^[1]	-92.0^[1]	-247^[1]
ZnSO₄ (ao)	-1047.7^[1]	-904.9^[1]	5.0^[1]	–
ZnSO₄ (cr) 1 hydrate	-1304.49^[1]	-1131.99^[1]	138.5^[1]	–
ZnSO₄ (cr) 6 hydrate	-2777.46^[1]	-2324.44^[1]	363.6^[1]	357.69^[1]
ZnSO₄ (cr) 7 hydrate	-3077.75^[1]	-2562.67^[1]	388.7^[1]	383.42^[1]
Na₂HPO₄ (cr)	-1748.1^[1]	-1608.2^[1]	150.50^[1]	135.31^[1]
Na₂HPO₄ (ai)	-1772.38^[1]	-1612.98^[1]	84.5^[1]	–
Na₂HPO₄ (cr) 2 hydrate	-2346.0^[1]	-2088.5^[1]	221.3^[1]	–
Na₂HPO₄ (cr) 7 hydrate	-3821.7^[1]	-3279.8^[1]	434.59^[1]	–
Na₂HPO₄ (cr) 12 hydrate	-5297.8^[1]	-4467.8^[1]	633.83^[1]	–

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

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
Zn₃(PO₄)₂ (cr)	-2892.4^[1]	–	–	–
Na₂SO₄ (cr) orthorhombic	-1387.08^[1]	-1270.16^[1]	149.58^[1]	128.20^[1]
Na₂SO₄ (cr) metastable	–	–	154.934^[1]	129.29^[1]
Na₂SO₄ (ai)	-1389.51^[1]	-1268.36^[1]	138.1^[1]	-201^[1]
Na₂SO₄ (cr) 10 hydrate	-4327.26^[1]	-3646.85^[1]	592.0^[1]	–
H₃PO₄ (cr)	-1279.0^[1]	-1119.1^[1]	110.50^[1]	106.06^[1]
H₃PO₄ (l)	-1266.9^[1]	–	–	–
H₃PO₄ (ai)	-1277.4^[1]	-1018.7^[1]	-220.3^[1]	–
H₃PO₄ (ao)	-1288.34^[1]	-1142.54^[1]	158.2^[1]	–
H₃PO₄ (cr) 0.5 hydrate	-1431.3^[1]	-1242.1^[1]	129.16^[1]	126.02^[1]
H₃PO₄ (cr) 1 hydrate	-1568.83^[1]	–	–	–

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

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

3ZnSO4 + 3Na2HPO4 💧→ Zn3(PO4)2↓ + 3Na2SO4 + H3PO4