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NiSO4 + Rb2S 💧→ NiS↓ + Rb2SO4

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Reaction of nickel(II) sulfate and rubidium sulfide
NiSO4Nickel(II) sulfate + Rb2SRubidium sulfide
💧
⟶
NiS↓Nickel(II) sulfide + Rb2SO4Rubidium sulfate

The reaction of nickel(II) sulfate and rubidium sulfide yields nickel(II) sulfide and rubidium sulfate. 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

Reaction of nickel(II) sulfate and rubidium sulfide
NiSO4Nickel(II) sulfate + Rb2SRubidium sulfide
💧
⟶
NiS↓Nickel(II) sulfide + Rb2SO4Rubidium sulfate

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
💧
⟶
Insoluble in water/Very slightly soluble in water/Slightly soluble in waterLewis conjugate + Product(Non-redox product)

Oxidation state of each atom

Reaction of nickel(II) sulfate and rubidium sulfide

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
NiSO4Nickel(II) sulfate1
Lewis acid
Very soluble in water
Rb2SRubidium sulfide1
Lewis base
Very soluble in water

Products

Chemical formulaNameCoefficientTypeType in general
equation
NiSNickel(II) sulfide1
Lewis conjugate
Insoluble in water
Rb2SO4Rubidium sulfate1
Non-redox product
–

Thermodynamic changes

Changes in standard condition (1)

Reaction of nickel(II) sulfate and rubidium sulfide
NiSO4Crystalline solid + Rb2SCrystalline solid
💧
⟶
NiS↓Crystalline solid + Rb2SO4Crystalline solid
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
−284.0–––
per 1 mol of
−284.0–––
per 1 mol of
−284.0–––
per 1 mol of
−284.0–––
per 1 mol of
−284.0–––

Changes in standard condition (2)

Reaction of nickel(II) sulfate and rubidium sulfide
NiSO4Crystalline solid + Rb2SCrystalline solid
💧
⟶
NiS↓Crystalline solidprecipitated + Rb2SO4Crystalline solid
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
−279.4–––
per 1 mol of
−279.4–––
per 1 mol of
−279.4–––
per 1 mol of
−279.4–––
per 1 mol of
−279.4–––

Changes in aqueous solution (1)

Reaction of nickel(II) sulfate and rubidium sulfide
◆
ΔrG−119.7 kJ/mol
K9.34 × 1020
pK−20.97
NiSO4Ionized aqueous solution + Rb2SIonized aqueous solution
💧
⟶
NiS↓Crystalline solid + Rb2SO4Ionized 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
−61.0−119.7196.6–
per 1 mol of
−61.0−119.7196.6–
per 1 mol of
−61.0−119.7196.6–
per 1 mol of
−61.0−119.7196.6–
per 1 mol of
−61.0−119.7196.6–

Changes in aqueous solution (2)

Reaction of nickel(II) sulfate and rubidium sulfide
◆
ΔrG−106.7 kJ/mol
K4.93 × 1018
pK−18.69
NiSO4Un-ionized aqueous solution + Rb2SIonized aqueous solution
💧
⟶
NiS↓Crystalline solid + Rb2SO4Ionized 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
−74.9−106.7105.8–
per 1 mol of
−74.9−106.7105.8–
per 1 mol of
−74.9−106.7105.8–
per 1 mol of
−74.9−106.7105.8–
per 1 mol of
−74.9−106.7105.8–

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
NiSO4 (cr)-872.91[1]-759.7[1]92[1]138[1]
NiSO4 (ai)-963.2[1]-790.3[1]-108.8[1]–
NiSO4 (ao)-949.3[1]-803.3[1]-18.0[1]–
NiSO4 (cr)
4 hydrate
-2104.1[1]–––
NiSO4 (cr)
6 hydrate
α, tetragonal, green
-2682.82[1]-2224.61[1]334.47[1]327.86[1]
NiSO4 (cr)
6 hydrate
β, monoclinic, blue
-2672.3[1]–––
NiSO4 (cr)
7 hydrate
-2976.33[1]-2461.83[1]378.94[1]364.59[1]
Rb2S (cr)-360.7[1]–––
Rb2S (ai)-469.4[1]-482.0[1]228.4[1]–
* (cr):Crystalline solid, (ai):Ionized aqueous solution, (ao):Un-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
NiS (cr)-82.0[1]-79.5[1]52.97[1]47.11[1]
NiS (cr)
precipitated
-77.4[1]–––
Rb2SO4 (cr)-1435.61[1]-1316.89[1]197.44[1]134.06[1]
Rb2SO4 (g)-1068.6[1]–––
Rb2SO4 (ai)-1411.60[1]-1312.50[1]263.2[1]–
* (cr):Crystalline solid, (g):Gas, (ai):Ionized aqueous solution

References

List of references

  1. 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
    National Institute of Standards and Technology (NIST)