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Chemical reactions
CuF + HI → CuI + HF

CuF + HI → CuI + HF

Last updated: June 13, 2022

Reaction of copper(I) fluoride and hydrogen iodide: CuFCopper(I) fluoride + HIHydrogen iodide
⟶
CuICopper(I) iodide + HFHydrogen fluoride

The reaction of copper(I) fluoride and hydrogen iodide yields copper(I) iodide and hydrogen fluoride. This reaction is an acid-base reaction and is classified as follows:

Reaction of salt of weak acid and strong acid with generating weak acid

Table of contents

Reaction data

Reactants

Chemical formula	Name	Coefficient	Type	Type in general equation
CuF	Copper(I) fluoride	1	Brønsted base	Salt of weak acid
HI	Hydrogen iodide	1	Brønsted acid	Strong acid

Products

Chemical formula	Name	Coefficient	Type	Type in general equation
CuI	Copper(I) iodide	1	Conjugate base	Salt of strong acid
HF	Hydrogen fluoride	1	Conjugate acid	Weak acid

Thermodynamic changes

Changes in standard condition

Reaction of copper(I) fluoride and hydrogen iodide ◆ Δ_rG −84 kJ/mol K 5.20 × 10¹⁴ pK −14.72: CuFSolid + HIGas
⟶
CuICrystalline solid + HFGas

	Standard enthalpy of reaction Δ_rH° kJ · mol⁻¹	Standard Gibbs energy of reaction Δ_rG° kJ · mol⁻¹	Standard entropy of reaction Δ_rS° J · K⁻¹ · mol⁻¹	Standard heat capacity of reaction at constant pressure Δ_rC_p° J · K⁻¹ · mol⁻¹
per 1 mol of Equation	−85	−84	−1.0	–
per 1 mol of Copper(I) fluoride	−85	−84	−1.0	–
per 1 mol of Hydrogen iodide	−85	−84	−1.0	–
per 1 mol of Copper(I) iodide	−85	−84	−1.0	–
per 1 mol of Hydrogen fluoride	−85	−84	−1.0	–

Changes in aqueous solution (1)

Reaction of copper(I) fluoride and hydrogen iodide ◆ Δ_rG −31 kJ/mol K 2.70 × 10⁵ pK −5.43: CuFSolid + HIIonized aqueous solution
⟶
CuICrystalline solid + HFGas

	Standard enthalpy of reaction Δ_rH° kJ · mol⁻¹	Standard Gibbs energy of reaction Δ_rG° kJ · mol⁻¹	Standard entropy of reaction Δ_rS° J · K⁻¹ · mol⁻¹	Standard heat capacity of reaction at constant pressure Δ_rC_p° J · K⁻¹ · mol⁻¹
per 1 mol of Equation	−4	−31	94.3	–
per 1 mol of Copper(I) fluoride	−4	−31	94.3	–
per 1 mol of Hydrogen iodide	−4	−31	94.3	–
per 1 mol of Copper(I) iodide	−4	−31	94.3	–
per 1 mol of Hydrogen fluoride	−4	−31	94.3	–

Changes in aqueous solution (2)

Reaction of copper(I) fluoride and hydrogen iodide ◆ Δ_rG −55 kJ/mol K 4.32 × 10⁹ pK −9.64: CuFSolid + HIIonized aqueous solution
⟶
CuICrystalline solid + HFUn-ionized aqueous solution

	Standard enthalpy of reaction Δ_rH° kJ · mol⁻¹	Standard Gibbs energy of reaction Δ_rG° kJ · mol⁻¹	Standard entropy of reaction Δ_rS° J · K⁻¹ · mol⁻¹	Standard heat capacity of reaction at constant pressure Δ_rC_p° J · K⁻¹ · mol⁻¹
per 1 mol of Equation	−53	−55	9.2	–
per 1 mol of Copper(I) fluoride	−53	−55	9.2	–
per 1 mol of Hydrogen iodide	−53	−55	9.2	–
per 1 mol of Copper(I) iodide	−53	−55	9.2	–
per 1 mol of Hydrogen fluoride	−53	−55	9.2	–

Changes in aqueous solution (3)

Reaction of copper(I) fluoride and hydrogen iodide ◆ Δ_rG −55 kJ/mol K 4.32 × 10⁹ pK −9.64: CuFSolid + HIIonized aqueous solution
⟶
CuICrystalline solid + HFUn-ionized aqueous solution

	Standard enthalpy of reaction Δ_rH° kJ · mol⁻¹	Standard Gibbs energy of reaction Δ_rG° kJ · mol⁻¹	Standard entropy of reaction Δ_rS° J · K⁻¹ · mol⁻¹	Standard heat capacity of reaction at constant pressure Δ_rC_p° J · K⁻¹ · mol⁻¹
per 1 mol of Equation	−53	−55	9.2	–
per 1 mol of Copper(I) fluoride	−53	−55	9.2	–
per 1 mol of Hydrogen iodide	−53	−55	9.2	–
per 1 mol of Copper(I) iodide	−53	−55	9.2	–
per 1 mol of Hydrogen fluoride	−53	−55	9.2	–

Changes in aqueous solution (4)

Reaction of copper(I) fluoride and hydrogen iodide ◆ Δ_rG −37 kJ/mol K 3.03 × 10⁶ pK −6.48: CuFSolid + HIIonized aqueous solution
⟶
CuICrystalline solid + HFIonized aqueous solution

	Standard enthalpy of reaction Δ_rH° kJ · mol⁻¹	Standard Gibbs energy of reaction Δ_rG° kJ · mol⁻¹	Standard entropy of reaction Δ_rS° J · K⁻¹ · mol⁻¹	Standard heat capacity of reaction at constant pressure Δ_rC_p° J · K⁻¹ · mol⁻¹
per 1 mol of Equation	−65	−37	−93.3	–
per 1 mol of Copper(I) fluoride	−65	−37	−93.3	–
per 1 mol of Hydrogen iodide	−65	−37	−93.3	–
per 1 mol of Copper(I) iodide	−65	−37	−93.3	–
per 1 mol of Hydrogen fluoride	−65	−37	−93.3	–

Thermodynamic data of reactants

Chemical formula	Standard enthalpy of formation Δ_fH° kJ · mol⁻¹	Standard Gibbs energy of formation Δ_fG° kJ · mol⁻¹	Standard molar entropy S° J · K⁻¹ · mol⁻¹	Standard molar heat capacity at constant pressure C_p° J · K⁻¹ · mol⁻¹
CuF (s)	-280	-260	64.9	–
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]

* (s):Solid, (g):Gas, (ai):Ionized aqueous solution

Thermodynamic data of products

Chemical formula	Standard enthalpy of formation Δ_fH° kJ · mol⁻¹	Standard Gibbs energy of formation Δ_fG° kJ · mol⁻¹	Standard molar entropy S° J · K⁻¹ · mol⁻¹	Standard molar heat capacity at constant pressure C_p° J · K⁻¹ · mol⁻¹
CuI (cr)	-67.8^[1]	-69.5^[1]	96.7^[1]	54.06^[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]	–

* (cr):Crystalline solid, (l):Liquid, (g):Gas, (ai):Ionized aqueous solution, (ao):Un-ionized aqueous solution

References

List of references

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
https://doi.org/10.18434/M32124
National Institute of Standards and Technology (NIST)
Citation list

Δ_rG	−84 kJ/mol
K	5.20 × 10¹⁴
pK	−14.72

Δ_rG	−31 kJ/mol
K	2.70 × 10⁵
pK	−5.43

Δ_rG	−55 kJ/mol
K	4.32 × 10⁹
pK	−9.64

Δ_rG	−55 kJ/mol
K	4.32 × 10⁹
pK	−9.64

CuF + HI → CuI + HF

Reaction data

Chemical equation

General equation

Oxidation state of each atom