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HgS + H2[PtCl6] → HgCl2 + PtCl4 + H2S↑

The reaction of mercury(II) sulfide and hexachloridoplatinic(IV) acid yields mercury(II) chloride, platinum(IV) chloride, and hydrogen sulfide. This reaction is an acid-base reaction and is classified as follows:

Table of contents
  1. 1Reaction data
  2. 2Thermodynamic changes
  3. 3References
  4. 4Related categories

Reaction data

Chemical equation

General equation

Oxidation state of each atom

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
HgSMercury(II) sulfide1
Brønsted base
Salt of weak acid
H2[PtCl6]Hexachloridoplatinic(IV) acid1
Brønsted acid
Strong acid

Products

Chemical formulaNameCoefficientTypeType in general
equation
HgCl2Mercury(II) chloride1
Conjugate base
Salt of strong acid
PtCl4Platinum(IV) chloride1
Conjugate base
Salt of strong acid
H2SHydrogen sulfide1
Conjugate acid
Weak acid

Thermodynamic changes

Changes in aqueous solution (1)

Reaction of mercury(II) sulfide and hexachloridoplatinic(IV) acid
HgSCrystalline solidred + H2[PtCl6]Ionized aqueous solution
HgCl2Un-ionized aqueous solution + PtCl4Aqueous solution + H2SGas
Standard enthalpy
of reaction
ΔrH°
kJ · mol−1
Standard
Gibbs energy
of reaction
ΔrG°
kJ · mol−1
Standard entropy
of reaction
ΔrS°
J · K−1 · mol−1
Standard heat
capacity of reaction
at constant pressure
ΔrCp°
J · K−1 · mol−1
per 1 mol of
Equation
175.3
175.3
175.3
175.3
175.3
per 1 mol of
175.3

Changes in aqueous solution (2)

Reaction of mercury(II) sulfide and hexachloridoplatinic(IV) acid
HgSCrystalline solidred + H2[PtCl6]Ionized aqueous solution
HgCl2Un-ionized aqueous solution + PtCl4Aqueous solution + H2SUn-ionized aqueous solution
Standard enthalpy
of reaction
ΔrH°
kJ · mol−1
Standard
Gibbs energy
of reaction
ΔrG°
kJ · mol−1
Standard entropy
of reaction
ΔrS°
J · K−1 · mol−1
Standard heat
capacity of reaction
at constant pressure
ΔrCp°
J · K−1 · mol−1
per 1 mol of
Equation
156.2
156.2
156.2
156.2
156.2
per 1 mol of
156.2

Thermodynamic data of reactants

Chemical formulaStandard enthalpy
of formation
ΔfH°
kJ · mol−1
Standard Gibbs
energy of
formation
ΔfG°
kJ · mol−1
Standard
molar entropy
S°
J · K−1 · mol−1
Standard molar
heat capacity at
constant pressure
Cp°
J · K−1 · mol−1
HgS (cr)
red
-58.2[1]-50.6[1]82.4[1]48.41[1]
HgS (cr)
black
-53.6[1]-47.7[1]88.3[1]
HgS (g)254.75[1]
H2[PtCl6] (ai)-668.2[1]-482.7[1]219.7[1]
H2[PtCl6] (cr)
6 hydrate
-2371.1[1]
* (cr):Crystalline solid, (g):Gas, (ai):Ionized aqueous solution

Thermodynamic data of products

Chemical formulaStandard enthalpy
of formation
ΔfH°
kJ · mol−1
Standard Gibbs
energy of
formation
ΔfG°
kJ · mol−1
Standard
molar entropy
S°
J · K−1 · mol−1
Standard molar
heat capacity at
constant pressure
Cp°
J · K−1 · mol−1
HgCl2 (cr)-224.3[1]-178.6[1]146.0[1]
HgCl2 (ao)-216.3[1]-173.2[1]155[1]
PtCl4 (cr)-231.8[1]
PtCl4 (aq)-314.2[1]
PtCl4 (cr)
5 hydrate
-1752.7[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]
* (cr):Crystalline solid, (ao):Un-ionized aqueous solution, (aq):Aqueous solution, (g):Gas

References

List of references

  1. 1