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Chemical reactions
2H2S + Na2[PtCl6] → 2S + Pt + 2NaCl + 4HCl

2H₂S + Na₂[PtCl₆] → 2S + Pt + 2NaCl + 4HCl

Last updated: May 12, 2022

Reaction of hydrogen sulfide and sodium hexachloridoplatinate(IV): 2H₂SHydrogen sulfide + Na₂[PtCl₆]Sodium hexachloridoplatinate(IV)
⟶
2SSulfur + PtPlatinum + 2NaClSodium chloride + 4HClHydrogen chloride

The reaction of hydrogen sulfide and sodium hexachloridoplatinate(IV) yields sulfur, platinum, sodium chloride, and hydrogen chloride (Other reactions are here). This reaction is an oxidation-reduction reaction and is classified as follows:

Reaction of reducing species and oxidizing species

Table of contents

Reaction data

Chemical equation

Reaction of hydrogen sulfide and sodium hexachloridoplatinate(IV): 2H₂SHydrogen sulfide + Na₂[PtCl₆]Sodium hexachloridoplatinate(IV)
⟶
2SSulfur + PtPlatinum + 2NaClSodium chloride + 4HClHydrogen chloride

General equation

Reaction of reducing species and oxidizing species: Reducing speciesReducing agent + Oxidizing speciesOxidizing agent
⟶
ProductOxidation product + ProductReduction product

Oxidation state of each atom

Reaction of hydrogen sulfide and sodium hexachloridoplatinate(IV)

Reactants

Chemical formula	Name	Coefficient	Type	Type in general equation
H₂S	Hydrogen sulfide	2	Reducing	Reducing
Na₂[PtCl₆]	Sodium hexachloridoplatinate(IV)	1	Oxidizing	Oxidizing

Products

Chemical formula	Name	Coefficient	Type	Type in general equation
S	Sulfur	2	Oxidized	–
Pt	Platinum	1	Reduced	–
NaCl	Sodium chloride	2	–	–
HCl	Hydrogen chloride	4	–	–

Thermodynamic changes

Changes in standard condition (1)

Reaction of hydrogen sulfide and sodium hexachloridoplatinate(IV): 2H₂SGas + Na₂[PtCl₆]Crystalline solid
⟶
2SCrystalline solidrhombic + PtCrystalline solid + 2NaClCrystalline solid + 4HClGas

	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	−34.4	–	–	–
per 1 mol of Hydrogen sulfide	−17.2	–	–	–
per 1 mol of Sodium hexachloridoplatinate(IV)	−34.4	–	–	–
per 1 mol of Sulfur	−17.2	–	–	–
per 1 mol of Platinum	−34.4	–	–	–
per 1 mol of Sodium chloride	−17.2	–	–	–
per 1 mol of Hydrogen chloride	−8.60	–	–	–

Changes in standard condition (2)

Reaction of hydrogen sulfide and sodium hexachloridoplatinate(IV): 2H₂SGas + Na₂[PtCl₆]Crystalline solid
⟶
2SCrystalline solidmonoclinic + PtCrystalline solid + 2NaClCrystalline solid + 4HClGas

	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	−33.7	–	–	–
per 1 mol of Hydrogen sulfide	−16.9	–	–	–
per 1 mol of Sodium hexachloridoplatinate(IV)	−33.7	–	–	–
per 1 mol of Sulfur	−16.9	–	–	–
per 1 mol of Platinum	−33.7	–	–	–
per 1 mol of Sodium chloride	−16.9	–	–	–
per 1 mol of Hydrogen chloride	−8.43	–	–	–

Changes in aqueous solution (1)

Reaction of hydrogen sulfide and sodium hexachloridoplatinate(IV): 2H₂SUn-ionized aqueous solution + Na₂[PtCl₆]Crystalline solid
⟶
2SCrystalline solidrhombic + PtCrystalline solid + 2NaClIonized aqueous solution + 4HClGas

	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	11.5	–	–	–
per 1 mol of Hydrogen sulfide	5.75	–	–	–
per 1 mol of Sodium hexachloridoplatinate(IV)	11.5	–	–	–
per 1 mol of Sulfur	5.75	–	–	–
per 1 mol of Platinum	11.5	–	–	–
per 1 mol of Sodium chloride	5.75	–	–	–
per 1 mol of Hydrogen chloride	2.88	–	–	–

Changes in aqueous solution (2)

Reaction of hydrogen sulfide and sodium hexachloridoplatinate(IV): 2H₂SUn-ionized aqueous solution + Na₂[PtCl₆]Crystalline solid
⟶
2SCrystalline solidrhombic + PtCrystalline solid + 2NaClIonized aqueous solution + 4HClIonized 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	−287.9	–	–	–
per 1 mol of Hydrogen sulfide	−143.9	–	–	–
per 1 mol of Sodium hexachloridoplatinate(IV)	−287.9	–	–	–
per 1 mol of Sulfur	−143.9	–	–	–
per 1 mol of Platinum	−287.9	–	–	–
per 1 mol of Sodium chloride	−143.9	–	–	–
per 1 mol of Hydrogen chloride	−71.97	–	–	–

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
H₂S (g)	-20.63^[1]	-33.56^[1]	205.79^[1]	34.23^[1]
H₂S (ao)	-39.7^[1]	-27.83^[1]	121^[1]	–
Na₂[PtCl₆] (cr)	-1115.9^[1]	–	–	–
Na₂[PtCl₆] (cr) 2 hydrate	-1723.8^[1]	–	–	–
Na₂[PtCl₆] (cr) 6 hydrate	-2912.1^[1]	–	–	–

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

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
S (cr) rhombic	0^[1]	0^[1]	31.80^[1]	22.64^[1]
S (cr) monoclinic	0.33^[1]	–	–	–
S (g)	278.805^[1]	238.250^[1]	167.821^[1]	23.673^[1]
Pt (cr)	0^[1]	0^[1]	41.63^[1]	25.86^[1]
Pt (g)	565.3^[1]	520.5^[1]	192.406^[1]	25.531^[1]
NaCl (cr)	-411.153^[1]	-384.138^[1]	72.13^[1]	50.50^[1]
NaCl (g)	-176.65^[1]	-196.66^[1]	229.81^[1]	35.77^[1]
NaCl (ai)	-407.27^[1]	-393.133^[1]	115.5^[1]	-90.0^[1]
HCl (g)	-92.307^[1]	-95.299^[1]	186.908^[1]	29.12^[1]
HCl (ai)	-167.159^[1]	-131.228^[1]	56.5^[1]	-136.4^[1]

* (cr):Crystalline solid, (g):Gas, (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)
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