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3Mn(NO3)2 + 3Na2HPO4 💧→ Mn3(PO4)2↓ + 6NaNO3 + H3PO4

3Mn(NO₃)₂ + 3Na₂HPO₄ 💧→ Mn₃(PO₄)₂↓ + 6NaNO₃ + H₃PO₄

Last updated: June 13, 2022

Reaction of manganese(II) nitrate and sodium hydrogenphosphate: 3Mn(NO₃)₂Manganese(II) nitrate + 3Na₂HPO₄Sodium hydrogenphosphate
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Mn₃(PO₄)₂↓Manganese(II) phosphate + 6NaNO₃Sodium nitrate + H₃PO₄Phosphoric acid

The reaction of manganese(II) nitrate and sodium hydrogenphosphate yields manganese(II) phosphate, sodium nitrate, 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

Chemical equation

Reaction of manganese(II) nitrate and sodium hydrogenphosphate: 3Mn(NO₃)₂Manganese(II) nitrate + 3Na₂HPO₄Sodium hydrogenphosphate
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Mn₃(PO₄)₂↓Manganese(II) phosphate + 6NaNO₃Sodium nitrate + H₃PO₄Phosphoric acid

General equation

Precipitation reaction: Miscible with water/Very soluble in water/Soluble in waterLewis acid + Miscible with water/Very soluble in water/Soluble in waterLewis base
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Insoluble in water/Very slightly soluble in water/Slightly soluble in waterLewis conjugate + Product(Non-redox product)

Oxidation state of each atom

Reaction of manganese(II) nitrate and sodium hydrogenphosphate

Reactants

Chemical formula	Name	Coefficient	Type	Type in general equation
Mn(NO₃)₂	Manganese(II) nitrate	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
Mn₃(PO₄)₂	Manganese(II) phosphate	1	Lewis conjugate	Insoluble in water
NaNO₃	Sodium nitrate	6	Non-redox product	–
H₃PO₄	Phosphoric acid	1	Non-redox product	–

Thermodynamic changes

Changes in standard condition

Reaction of manganese(II) nitrate and sodium hydrogenphosphate: 3Mn(NO₃)₂Crystalline solid + 3Na₂HPO₄Crystalline solid
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Mn₃(PO₄)₂↓Crystalline solid + 6NaNO₃Crystalline solid + 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	−229.7	–	–	–
per 1 mol of Manganese(II) nitrate	−76.57	–	–	–
per 1 mol of Sodium hydrogenphosphate	−76.57	–	–	–
per 1 mol of Manganese(II) phosphate	−229.7	–	–	–
per 1 mol of Sodium nitrate	−38.28	–	–	–
per 1 mol of Phosphoric acid	−229.7	–	–	–

Changes in aqueous solution (1)

Reaction of manganese(II) nitrate and sodium hydrogenphosphate: 3Mn(NO₃)₂Ionized aqueous solution + 3Na₂HPO₄Ionized aqueous solution
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Mn₃(PO₄)₂↓Crystalline solid + 6NaNO₃Ionized 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	133.7	–	–	–
per 1 mol of Manganese(II) nitrate	44.57	–	–	–
per 1 mol of Sodium hydrogenphosphate	44.57	–	–	–
per 1 mol of Manganese(II) phosphate	133.7	–	–	–
per 1 mol of Sodium nitrate	22.28	–	–	–
per 1 mol of Phosphoric acid	133.7	–	–	–

Changes in aqueous solution (2)

Reaction of manganese(II) nitrate and sodium hydrogenphosphate: 3Mn(NO₃)₂Ionized aqueous solution + 3Na₂HPO₄Ionized aqueous solution
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Mn₃(PO₄)₂↓Crystalline solid + 6NaNO₃Ionized 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	133.7	–	–	–
per 1 mol of Manganese(II) nitrate	44.57	–	–	–
per 1 mol of Sodium hydrogenphosphate	44.57	–	–	–
per 1 mol of Manganese(II) phosphate	133.7	–	–	–
per 1 mol of Sodium nitrate	22.28	–	–	–
per 1 mol of Phosphoric acid	133.7	–	–	–

Changes in aqueous solution (3)

Reaction of manganese(II) nitrate and sodium hydrogenphosphate: 3Mn(NO₃)₂Ionized aqueous solution + 3Na₂HPO₄Ionized aqueous solution
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Mn₃(PO₄)₂↓Crystalline solid + 6NaNO₃Ionized 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	144.7	–	–	–
per 1 mol of Manganese(II) nitrate	48.23	–	–	–
per 1 mol of Sodium hydrogenphosphate	48.23	–	–	–
per 1 mol of Manganese(II) phosphate	144.7	–	–	–
per 1 mol of Sodium nitrate	24.12	–	–	–
per 1 mol of Phosphoric acid	144.7	–	–	–

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
Mn(NO₃)₂ (cr)	-576.26^[1]	–	–	–
Mn(NO₃)₂ (ai)	-635.5^[1]	-450.9^[1]	218^[1]	-121^[1]
Mn(NO₃)₂ (vit) 6 hydrate	-2371.9^[1]	–	–	–
Mn(NO₃)₂ (l) 6 hydrate	-2331.62^[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, (vit):Vitreous liquid, (l):Liquid

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
Mn₃(PO₄)₂ (cr)	-3116.7^[1]	–	–	–
NaNO₃ (cr)	-467.85^[1]	-367.00^[1]	116.52^[1]	92.88^[1]
NaNO₃ (ai)	-447.48^[1]	-373.15^[1]	205.4^[1]	-40.2^[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)
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