You-iggy

Ca(NO2)2 + 2HI → CaI2 + 2HNO2

The reaction of calcium nitrite and hydrogen iodide yields calcium iodide and nitrous acid (Other reactions are here). 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 reactions
  5. 5Related categories

Reaction data

Chemical equation

General equation

Oxidation state of each atom

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
Ca(NO2)2Calcium nitrite1
Brønsted base
Salt of weak acid
HIHydrogen iodide2
Brønsted acid
Strong acid

Products

Chemical formulaNameCoefficientTypeType in general
equation
CaI2Calcium iodide1
Conjugate base
Salt of strong acid
HNO2Nitrous acid2
Conjugate acid
Weak acid

Thermodynamic changes

Changes in standard condition

Reaction of calcium nitrite and hydrogen iodide
Ca(NO2)2Crystalline solid + 2HIIonized aqueous solution
CaI2Ionized aqueous solution + 2HNO2Un-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
−39.8
per 1 mol of
−39.8
per 1 mol of
−19.9
per 1 mol of
−39.8
per 1 mol of
−19.9

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
Ca(NO2)2 (cr)-741.4[1]
Ca(NO2)2 (cr)
4 hydrate
-1885.7[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, (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
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]
HNO2 (g)
cis
-77.99[1]-42.94[1]248.76[1]44.77[1]
HNO2 (g)
trans
-80.12[1]-45.24[1]249.22[1]46.07[1]
HNO2 (g)-79.5[1]-46.0[1]254.1[1]45.6[1]
HNO2 (ao)-119.2[1]-50.6[1]135.6[1]
* (cr):Crystalline solid, (g):Gas, (ai):Ionized aqueous solution, (ao):Un-ionized aqueous solution

References

List of references

  1. 1