You-iggy
  1. Home
  2. Chemical reactions
  3. HF2^− → HF + F^−

HF2− → HF + F−

Last updated:
Electrolytic dissociation of hydrogendifluoride ion
HF2−Hydrogendifluoride ion
⟶
HFHydrogen fluoride + F−Fluoride ion

Electrolytic dissociation of hydrogendifluoride ion yields hydrogen fluoride and fluoride ion (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

Electrolytic dissociation of hydrogendifluoride ion
HF2−Hydrogendifluoride ion
⟶
HFHydrogen fluoride + F−Fluoride ion

General equation

Electrolytic dissociation of ion
Polyatomic ion
⟶
Cation/Electrically neutral + Anion/Electrically neutral

Oxidation state of each atom

Electrolytic dissociation of hydrogendifluoride ion

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
HF2−Hydrogendifluoride ion1
–
Polyatomic ion

Products

Chemical formulaNameCoefficientTypeType in general
equation
HFHydrogen fluoride1
–
Electrically neutral
F−Fluoride ion1
–
Anion

Thermodynamic changes

Changes in standard condition (1)

Electrolytic dissociation of hydrogendifluoride ion
◆
ΔrG26.1 kJ/mol
K0.27 × 10−4
pK4.57
HF2−Un-ionized aqueous solution
⟶
HFGas + F−Un-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
46.226.167.5–
per 1 mol of
Hydrogendifluoride ion
46.226.167.5–
per 1 mol of
46.226.167.5–
per 1 mol of
Fluoride ion
46.226.167.5–

Changes in standard condition (2)

Electrolytic dissociation of hydrogendifluoride ion
◆
ΔrG2.47 kJ/mol
K0.37 × 100
pK0.43
HF2−Un-ionized aqueous solution
⟶
HFUn-ionized aqueous solution + F−Un-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
−2.772.47−17.6–
per 1 mol of
Hydrogendifluoride ion
−2.772.47−17.6–
per 1 mol of
−2.772.47−17.6–
per 1 mol of
Fluoride ion
−2.772.47−17.6–

Changes in standard condition (3)

Electrolytic dissociation of hydrogendifluoride ion
◆
ΔrG2.47 kJ/mol
K0.37 × 100
pK0.43
HF2−Un-ionized aqueous solution
⟶
HFUn-ionized aqueous solution + F−Un-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
−2.772.47−17.6–
per 1 mol of
Hydrogendifluoride ion
−2.772.47−17.6–
per 1 mol of
−2.772.47−17.6–
per 1 mol of
Fluoride ion
−2.772.47−17.6–

Changes in standard condition (4)

Electrolytic dissociation of hydrogendifluoride ion
◆
ΔrG20.50 kJ/mol
K0.26 × 10−3
pK3.59
HF2−Un-ionized aqueous solution
⟶
HFIonized aqueous solution + F−Un-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
−15.3220.50−120.1–
per 1 mol of
Hydrogendifluoride ion
−15.3220.50−120.1–
per 1 mol of
−15.3220.50−120.1–
per 1 mol of
Fluoride ion
−15.3220.50−120.1–

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
HF2− (ao)-649.94[1]-578.08[1]92.5[1]–
* (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
HF (l)
x denotes undetermined zero point entropy
-299.78[1]–75.40+x[1]–
HF (g)-271.1[1]-273.2[1]173.779[1]29.133[1]
HF (ai)-332.63[1]-278.79[1]-13.8[1]-106.7[1]
HF (ao)-320.08[1]-296.82[1]88.7[1]–
F− (g)-255.39[1]–––
F− (ao)-332.63[1]-278.79[1]-13.8[1]-106.7[1]
* (l):Liquid, (g):Gas, (ai):Ionized aqueous solution, (ao):Un-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)