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Ca(CH3COO)2 + NH4HSO4 💧→ CaSO4↓ + CH3COONH4 + CH3COOH

Ca(CH₃COO)₂ + NH₄HSO₄ 💧→ CaSO₄↓ + CH₃COONH₄ + CH₃COOH

Last updated: June 13, 2022

Reaction of calcium acetate and ammonium hydrogensulfate: Ca(CH₃COO)₂Calcium acetate + NH₄HSO₄Ammonium hydrogensulfate
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CaSO₄↓Calcium sulfate + CH₃COONH₄Ammonium acetate + CH₃COOHAcetic acid

The reaction of calcium acetate and ammonium hydrogensulfate yields calcium sulfate, ammonium acetate, and acetic 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
Ca(CH₃COO)₂	Calcium acetate	1	Lewis acid	Very soluble in water
NH₄HSO₄	Ammonium hydrogensulfate	1	Lewis base	Very soluble in water

Products

Chemical formula	Name	Coefficient	Type	Type in general equation
CaSO₄	Calcium sulfate	1	Lewis conjugate	Slightly soluble in water
CH₃COONH₄	Ammonium acetate	1	Non-redox product	–
CH₃COOH	Acetic acid	1	Non-redox product	–

Thermodynamic changes

Changes in standard condition (1)

Reaction of calcium acetate and ammonium hydrogensulfate: Ca(CH₃COO)₂Crystalline solid + NH₄HSO₄Crystalline solid
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CaSO₄↓Crystalline solidinsoluble, anhydrite + CH₃COONH₄Crystalline solid + CH₃COOHLiquid

	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	−28.3	–	–	–
per 1 mol of Calcium acetate	−28.3	–	–	–
per 1 mol of Ammonium hydrogensulfate	−28.3	–	–	–
per 1 mol of Calcium sulfate	−28.3	–	–	–
per 1 mol of Ammonium acetate	−28.3	–	–	–
per 1 mol of Acetic acid	−28.3	–	–	–

Changes in standard condition (2)

Reaction of calcium acetate and ammonium hydrogensulfate: Ca(CH₃COO)₂Crystalline solid + NH₄HSO₄Crystalline solid
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CaSO₄↓Crystalline solidsoluble, α + CH₃COONH₄Crystalline solid + CH₃COOHLiquid

	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	−19.4	–	–	–
per 1 mol of Calcium acetate	−19.4	–	–	–
per 1 mol of Ammonium hydrogensulfate	−19.4	–	–	–
per 1 mol of Calcium sulfate	−19.4	–	–	–
per 1 mol of Ammonium acetate	−19.4	–	–	–
per 1 mol of Acetic acid	−19.4	–	–	–

Changes in standard condition (3)

Reaction of calcium acetate and ammonium hydrogensulfate: Ca(CH₃COO)₂Crystalline solid + NH₄HSO₄Crystalline solid
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CaSO₄↓Crystalline solidsoluble, β + CH₃COONH₄Crystalline solid + CH₃COOHLiquid

	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	−15.0	–	–	–
per 1 mol of Calcium acetate	−15.0	–	–	–
per 1 mol of Ammonium hydrogensulfate	−15.0	–	–	–
per 1 mol of Calcium sulfate	−15.0	–	–	–
per 1 mol of Ammonium acetate	−15.0	–	–	–
per 1 mol of Acetic acid	−15.0	–	–	–

Changes in aqueous solution (1)

Reaction of calcium acetate and ammonium hydrogensulfate ◆ Δ_rG −39.46 kJ/mol K 8.19 × 10⁶ pK −6.91: Ca(CH₃COO)₂Ionized aqueous solution + NH₄HSO₄Ionized aqueous solution
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CaSO₄↓Crystalline solidinsoluble, anhydrite + CH₃COONH₄Ionized aqueous solution + CH₃COOHUn-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	−3.68	−39.46	120.1	–
per 1 mol of Calcium acetate	−3.68	−39.46	120.1	–
per 1 mol of Ammonium hydrogensulfate	−3.68	−39.46	120.1	–
per 1 mol of Calcium sulfate	−3.68	−39.46	120.1	–
per 1 mol of Ammonium acetate	−3.68	−39.46	120.1	–
per 1 mol of Acetic acid	−3.68	−39.46	120.1	–

Changes in aqueous solution (2)

Reaction of calcium acetate and ammonium hydrogensulfate ◆ Δ_rG −31.09 kJ/mol K 2.80 × 10⁵ pK −5.45: Ca(CH₃COO)₂Ionized aqueous solution + NH₄HSO₄Ionized aqueous solution
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CaSO₄↓Crystalline solidsoluble, α + CH₃COONH₄Ionized aqueous solution + CH₃COOHUn-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	5.19	−31.09	121.8	–
per 1 mol of Calcium acetate	5.19	−31.09	121.8	–
per 1 mol of Ammonium hydrogensulfate	5.19	−31.09	121.8	–
per 1 mol of Calcium sulfate	5.19	−31.09	121.8	–
per 1 mol of Ammonium acetate	5.19	−31.09	121.8	–
per 1 mol of Acetic acid	5.19	−31.09	121.8	–

Changes in aqueous solution (3)

Reaction of calcium acetate and ammonium hydrogensulfate ◆ Δ_rG −26.65 kJ/mol K 4.67 × 10⁴ pK −4.67: Ca(CH₃COO)₂Ionized aqueous solution + NH₄HSO₄Ionized aqueous solution
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CaSO₄↓Crystalline solidsoluble, β + CH₃COONH₄Ionized aqueous solution + CH₃COOHUn-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	9.63	−26.65	121.8	–
per 1 mol of Calcium acetate	9.63	−26.65	121.8	–
per 1 mol of Ammonium hydrogensulfate	9.63	−26.65	121.8	–
per 1 mol of Calcium sulfate	9.63	−26.65	121.8	–
per 1 mol of Ammonium acetate	9.63	−26.65	121.8	–
per 1 mol of Acetic acid	9.63	−26.65	121.8	–

Changes in aqueous solution (4)

Reaction of calcium acetate and ammonium hydrogensulfate ◆ Δ_rG −12.31 kJ/mol K 1.43 × 10² pK −2.16: Ca(CH₃COO)₂Ionized aqueous solution + NH₄HSO₄Ionized aqueous solution
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CaSO₄↓Crystalline solidinsoluble, anhydrite + CH₃COONH₄Ionized aqueous solution + CH₃COOHIonized 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	−3.93	−12.31	28.0	–
per 1 mol of Calcium acetate	−3.93	−12.31	28.0	–
per 1 mol of Ammonium hydrogensulfate	−3.93	−12.31	28.0	–
per 1 mol of Calcium sulfate	−3.93	−12.31	28.0	–
per 1 mol of Ammonium acetate	−3.93	−12.31	28.0	–
per 1 mol of Acetic acid	−3.93	−12.31	28.0	–

Changes in aqueous solution (5)

Reaction of calcium acetate and ammonium hydrogensulfate ◆ Δ_rG −3.94 kJ/mol K 4.90 × 10⁰ pK −0.69: Ca(CH₃COO)₂Ionized aqueous solution + NH₄HSO₄Ionized aqueous solution
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CaSO₄↓Crystalline solidsoluble, α + CH₃COONH₄Ionized aqueous solution + CH₃COOHIonized 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	4.94	−3.94	29.7	–
per 1 mol of Calcium acetate	4.94	−3.94	29.7	–
per 1 mol of Ammonium hydrogensulfate	4.94	−3.94	29.7	–
per 1 mol of Calcium sulfate	4.94	−3.94	29.7	–
per 1 mol of Ammonium acetate	4.94	−3.94	29.7	–
per 1 mol of Acetic acid	4.94	−3.94	29.7	–

Changes in aqueous solution (6)

Reaction of calcium acetate and ammonium hydrogensulfate ◆ Δ_rG 0.50 kJ/mol K 0.82 × 10⁰ pK 0.09: Ca(CH₃COO)₂Ionized aqueous solution + NH₄HSO₄Ionized aqueous solution
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CaSO₄↓Crystalline solidsoluble, β + CH₃COONH₄Ionized aqueous solution + CH₃COOHIonized 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	9.38	0.50	29.7	–
per 1 mol of Calcium acetate	9.38	0.500	29.7	–
per 1 mol of Ammonium hydrogensulfate	9.38	0.500	29.7	–
per 1 mol of Calcium sulfate	9.38	0.500	29.7	–
per 1 mol of Ammonium acetate	9.38	0.500	29.7	–
per 1 mol of Acetic acid	9.38	0.500	29.7	–

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
Ca(CH₃COO)₂ (cr)	-1479.5^[1]	–	–	–
Ca(CH₃COO)₂ (ai)	-1514.86^[1]	-1292.19^[1]	120.1^[1]	–
Ca(CH₃COO)₂ (cr) 1 hydrate	-1772.3^[1]	–	–	–
NH₄HSO₄ (cr)	-1026.96^[1]	–	–	–
NH₄HSO₄ (ai)	-1019.85^[1]	-835.21^[1]	245.2^[1]	-3.8^[1]

* (cr):Crystalline solid, (ai):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
CaSO₄ (cr) insoluble, anhydrite	-1434.11^[1]	-1321.79^[1]	106.7^[1]	99.66^[1]
CaSO₄ (cr) soluble, α	-1425.24^[1]	-1313.42^[1]	108.4^[1]	100.21^[1]
CaSO₄ (cr) soluble, β	-1420.80^[1]	-1308.98^[1]	108.4^[1]	99.04^[1]
CaSO₄ (ai)	-1452.10^[1]	-1298.10^[1]	-33.1^[1]	–
CaSO₄ (cr) 0.5 hydrate macrocrystalline, α	-1576.74^[1]	-1436.74^[1]	130.5^[1]	119.41^[1]
CaSO₄ (cr) 0.5 hydrate microcrystalline, β	-1574.65^[1]	-1435.78^[1]	134.3^[1]	124.22^[1]
CaSO₄ (cr) 2 hydrate selenite	-2022.63^[1]	-1797.28^[1]	194.1^[1]	186.02^[1]
CH₃COONH₄ (cr)	-616.14^[1]	–	–	–
CH₃COONH₄ (ai)	-618.52^[1]	-448.61^[1]	200.0^[1]	73.6^[1]
CH₃COOH (l)	-484.5^[1]	-389.9^[1]	159.8^[1]	124.3^[1]
CH₃COOH (g)	-432.25^[1]	-374.0^[1]	282.5^[1]	66.5^[1]
CH₃COOH (ai)	-486.01^[1]	-369.31^[1]	86.6^[1]	-6.3^[1]
CH₃COOH (ao)	-485.76^[1]	-396.46^[1]	178.7^[1]	–

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

Δ_rG	−39.46 kJ/mol
K	8.19 × 10⁶
pK	−6.91

Δ_rG	−31.09 kJ/mol
K	2.80 × 10⁵
pK	−5.45

Δ_rG	−26.65 kJ/mol
K	4.67 × 10⁴
pK	−4.67

Δ_rG	−12.31 kJ/mol
K	1.43 × 10²
pK	−2.16

Ca(CH3COO)2 + NH4HSO4 💧→ CaSO4↓ + CH3COONH4 + CH3COOH

Reaction data

Chemical equation

General equation

Oxidation state of each atom