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CaI2 + 2HClO4 → Ca(ClO4)2 + 2HI↑

The reaction of calcium iodide and perchloric acid yields calcium perchlorate and hydrogen iodide. 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
CaI2Calcium iodide1
Brønsted base
Salt of volatile acid
HClO4Perchloric acid2
Brønsted acid
Nonvolatile acid

Products

Chemical formulaNameCoefficientTypeType in general
equation
Ca(ClO4)2Calcium perchlorate1
Conjugate base
Salt of non volatile acid
HIHydrogen iodide2
Conjugate acid
Volatile acid

Thermodynamic changes

Changes in standard condition

Reaction of calcium iodide and perchloric acid
CaI2Crystalline solid + 2HClO4Liquid
Ca(ClO4)2Crystalline solid + 2HIGas
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
−69.1
per 1 mol of
−69.1
per 1 mol of
−34.5
−69.1
per 1 mol of
−34.5

Changes in aqueous solution (1)

Reaction of calcium iodide and perchloric acid
ΔrG106.54 kJ/mol
K0.22 × 10−18
pK18.67
CaI2Ionized aqueous solution + 2HClO4Ionized aqueous solution
Ca(ClO4)2Ionized aqueous solution + 2HIGas
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
163.34106.54190.6
per 1 mol of
163.34106.54190.6
per 1 mol of
81.67053.27095.30
163.34106.54190.6
per 1 mol of
81.67053.27095.30

Changes in aqueous solution (2)

Reaction of calcium iodide and perchloric acid
ΔrG0.00 kJ/mol
K1.00 × 100
pK0.00
CaI2Ionized aqueous solution + 2HClO4Ionized aqueous solution
Ca(ClO4)2Ionized aqueous solution + 2HIIonized 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
0.000.000.0
per 1 mol of
0.000.000.0
per 1 mol of
0.000.000.0
0.000.000.0
per 1 mol of
0.000.000.0

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
CaI2 (cr)-533.5[1]-528.9[1]142[1]
CaI2 (g)-272[1]
CaI2 (ai)-653.21[1]-656.72[1]169.5[1]
CaI2 (cr)
8 hydrate
-2929.6[1]
HClO4 (l)-40.58[1]
HClO4 (ai)-129.33[1]-8.52[1]182.0[1]
HClO4 (cr)
1 hydrate
-382.21[1]
HClO4 (l)
2 hydrate
-677.98[1]
* (cr):Crystalline solid, (g):Gas, (ai):Ionized aqueous solution, (l):Liquid

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
Ca(ClO4)2 (cr)-736.76[1]
Ca(ClO4)2 (ai)-801.49[1]-570.62[1]310.9[1]
Ca(ClO4)2 (cr)
4 hydrate
-1948.9[1]-1476.47[1]433.5[1]
HI (g)26.48[1]1.70[1]206.594[1]29.158[1]
HI (ai)-55.19[1]-51.57[1]111.3[1]-142.3[1]
* (cr):Crystalline solid, (ai):Ionized aqueous solution, (g):Gas

References

List of references

  1. 1