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ZnSO4 + KHS 💧→ ZnS↓ + KHSO4

ZnSO₄ + KHS 💧→ ZnS↓ + KHSO₄

Last updated: June 13, 2022

Reaction of zinc sulfate and potassium hydrogensulfide: ZnSO₄Zinc sulfate + KHSPotassium hydrogensulfide
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ZnS↓Zinc sulfide + KHSO₄Potassium hydrogensulfate

The reaction of zinc sulfate and potassium hydrogensulfide yields zinc sulfide and potassium hydrogensulfate. 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	1	Lewis acid	Very soluble in water
KHS	Potassium hydrogensulfide	1	Lewis base	Soluble in water

Products

Chemical formula	Name	Coefficient	Type	Type in general equation
ZnS	Zinc sulfide	1	Lewis conjugate	Insoluble in water
KHSO₄	Potassium hydrogensulfate	1	Non-redox product	–

Thermodynamic changes

Changes in standard condition

Reaction of zinc sulfate and potassium hydrogensulfide: ZnSO₄Crystalline solid + KHSCrystalline solid
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ZnS↓Crystalline solid + KHSO₄Crystalline 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	−118.7	–	–	–
per 1 mol of Zinc sulfate	−118.7	–	–	–
per 1 mol of Potassium hydrogensulfide	−118.7	–	–	–
per 1 mol of Zinc sulfide	−118.7	–	–	–
per 1 mol of Potassium hydrogensulfate	−118.7	–	–	–

Changes in aqueous solution (1)

Reaction of zinc sulfate and potassium hydrogensulfide ◆ Δ_rG −64.4 kJ/mol K 1.92 × 10¹¹ pK −11.28: ZnSO₄Un-ionized aqueous solution + KHSIonized aqueous solution
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ZnS↓Crystalline solid + KHSO₄Ionized 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	−28.1	−64.4	121.7	–
per 1 mol of Zinc sulfate	−28.1	−64.4	121.7	–
per 1 mol of Potassium hydrogensulfide	−28.1	−64.4	121.7	–
per 1 mol of Zinc sulfide	−28.1	−64.4	121.7	–
per 1 mol of Potassium hydrogensulfate	−28.1	−64.4	121.7	–

Changes in aqueous solution (2)

Reaction of zinc sulfate and potassium hydrogensulfide ◆ Δ_rG −77.69 kJ/mol K 4.08 × 10¹³ pK −13.61: ZnSO₄Ionized aqueous solution + KHSIonized aqueous solution
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ZnS↓Crystalline solid + KHSO₄Ionized 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	−12.6	−77.69	218.7	–
per 1 mol of Zinc sulfate	−12.6	−77.69	218.7	–
per 1 mol of Potassium hydrogensulfide	−12.6	−77.69	218.7	–
per 1 mol of Zinc sulfide	−12.6	−77.69	218.7	–
per 1 mol of Potassium hydrogensulfate	−12.6	−77.69	218.7	–

Changes in aqueous solution (3)

Reaction of zinc sulfate and potassium hydrogensulfide ◆ Δ_rG −64.4 kJ/mol K 1.92 × 10¹¹ pK −11.28: ZnSO₄Un-ionized aqueous solution + KHSIonized aqueous solution
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ZnS↓Crystalline solid + KHSO₄Ionized 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	−28.1	−64.4	121.7	–
per 1 mol of Zinc sulfate	−28.1	−64.4	121.7	–
per 1 mol of Potassium hydrogensulfide	−28.1	−64.4	121.7	–
per 1 mol of Zinc sulfide	−28.1	−64.4	121.7	–
per 1 mol of Potassium hydrogensulfate	−28.1	−64.4	121.7	–

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
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]
KHS (cr)	-265.10^[1]	–	–	75.31^[1]
KHS (ai)	-269.9^[1]	-271.19^[1]	165.3^[1]	–
KHS (cr) 0.25 hydrate	-337.2^[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
ZnS (cr)	-205.98^[1]	-201.29^[1]	57.7^[1]	46.0^[1]
KHSO₄ (cr)	-1160.6^[1]	-1031.3^[1]	138.1^[1]	–
KHSO₄ (ai)	-1139.72^[1]	-1039.18^[1]	234.3^[1]	-63^[1]

* (cr):Crystalline solid, (ai):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	−64.4 kJ/mol
K	1.92 × 10¹¹
pK	−11.28

Δ_rG	−77.69 kJ/mol
K	4.08 × 10¹³
pK	−13.61

Δ_rG	−64.4 kJ/mol
K	1.92 × 10¹¹
pK	−11.28

ZnSO4 + KHS 💧→ ZnS↓ + KHSO4

Reaction data

Chemical equation

General equation

Oxidation state of each atom