CuSCN + HCl → CuCl + HSCN

Last updated: June 13, 2022

Reaction of copper(I) thiocyanate and hydrogen chloride: CuSCNCopper(I) thiocyanate + HClHydrogen chloride
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CuClCopper(I) chloride + HSCNThiocyanic acid

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

Table of contents

Reaction data

Chemical formula	Name	Coefficient	Type	Type in general equation
CuSCN	Copper(I) thiocyanate	1	Brønsted base	Salt of weak acid
HCl	Hydrogen chloride	1	Brønsted acid	Strong acid

Chemical formula	Name	Coefficient	Type	Type in general equation
CuCl	Copper(I) chloride	1	Conjugate base	Salt of strong acid
HSCN	Thiocyanic acid	1	Conjugate acid	Weak acid

Reaction of copper(I) thiocyanate and hydrogen chloride ◆ Δ_rG −33.76 kJ/mol K 8.21 × 10⁵ pK −5.91: CuSCNIonized aqueous solution + HClIonized aqueous solution
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CuClCrystalline solid + HSCNUn-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	–	−33.76	–	–
per 1 mol of Copper(I) thiocyanate	–	−33.76	–	–
per 1 mol of Hydrogen chloride	–	−33.76	–	–
per 1 mol of Copper(I) chloride	–	−33.76	–	–
per 1 mol of Thiocyanic acid	–	−33.76	–	–

Reaction of copper(I) thiocyanate and hydrogen chloride ◆ Δ_rG −38.61 kJ/mol K 5.81 × 10⁶ pK −6.76: CuSCNIonized aqueous solution + HClIonized aqueous solution
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CuClCrystalline solid + HSCNIonized 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	−41.7	−38.61	−10.9	–
per 1 mol of Copper(I) thiocyanate	−41.7	−38.61	−10.9	–
per 1 mol of Hydrogen chloride	−41.7	−38.61	−10.9	–
per 1 mol of Copper(I) chloride	−41.7	−38.61	−10.9	–
per 1 mol of Thiocyanic acid	−41.7	−38.61	−10.9	–

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
CuSCN (cr)	–	69.9^[1]	–	–
CuSCN (ai)	148.11^[1]	142.69^[1]	184.9^[1]	–
HCl (g)	-92.307^[1]	-95.299^[1]	186.908^[1]	29.12^[1]
HCl (ai)	-167.159^[1]	-131.228^[1]	56.5^[1]	-136.4^[1]

* (cr):Crystalline solid, (ai):Ionized aqueous solution, (g):Gas

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
CuCl (cr)	-137.2^[1]	-119.86^[1]	86.2^[1]	48.5^[1]
HSCN (ai)	76.44^[1]	92.71^[1]	144.3^[1]	-40.2^[1]
HSCN (ao)	–	97.56^[1]	–	–

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