CuSCN + HI → CuI + HSCN
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The reaction of copper(I) thiocyanate and hydrogen iodide yields copper(I) iodide and thiocyanic acid. This reaction is an acid-base reaction and is classified as follows:
Table of contents
Reaction data
Chemical equation
- Reaction of copper(I) thiocyanate and hydrogen iodide
General equation
- Salt of weak acidBrønsted base + Strong acidBrønsted acid ⟶ Salt of strong acidConjugate base + Weak acidConjugate acid
Oxidation state of each atom
- Reaction of copper(I) thiocyanate and hydrogen iodide
Reactants
Chemical formula | Name | Coefficient | Type | Type in general equation |
---|---|---|---|---|
CuSCN | Copper(I) thiocyanate | 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 |
HSCN | Thiocyanic acid | 1 | Conjugate acid | Weak acid |
Thermodynamic changes
Changes in aqueous solution (1)
- Reaction of copper(I) thiocyanate and hydrogen iodide◆
ΔrG −63.1 kJ/mol K 1.13 × 1011 pK −11.05
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 | – | −63.1 | – | – |
per 1 mol of | – | −63.1 | – | – |
per 1 mol of | – | −63.1 | – | – |
per 1 mol of | – | −63.1 | – | – |
per 1 mol of | – | −63.1 | – | – |
Changes in aqueous solution (2)
- Reaction of copper(I) thiocyanate and hydrogen iodide◆
ΔrG −67.9 kJ/mol K 7.86 × 1011 pK −11.90
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 | −84.3 | −67.9 | −55.2 | – |
per 1 mol of | −84.3 | −67.9 | −55.2 | – |
per 1 mol of | −84.3 | −67.9 | −55.2 | – |
per 1 mol of | −84.3 | −67.9 | −55.2 | – |
per 1 mol of | −84.3 | −67.9 | −55.2 | – |
Thermodynamic data of reactants
Chemical formula | Standard 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 |
---|---|---|---|---|
CuSCN (cr) | – | 69.9[1] | – | – |
CuSCN (ai) | 148.11[1] | 142.69[1] | 184.9[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
Thermodynamic data of products
Chemical formula | Standard 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 |
---|---|---|---|---|
CuI (cr) | -67.8[1] | -69.5[1] | 96.7[1] | 54.06[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
References
List of references
- 1Janiel J. Reed (1989)The NBS Tables of Chemical Thermodynamic Properties: Selected Values for Inorganic and C1 and C2 Organic Substances in SI UnitsNational Institute of Standards and Technology (NIST)
- ^ ΔfG°, 69.9 kJ · mol−1
- ^ ΔfH°, 148.11 kJ · mol−1
- ^ ΔfG°, 142.69 kJ · mol−1
- ^ S°, 184.9 J · K−1 · mol−1
- ^ ΔfH°, 26.48 kJ · mol−1
- ^ ΔfG°, 1.70 kJ · mol−1
- ^ S°, 206.594 J · K−1 · mol−1
- ^ Cp°, 29.158 J · K−1 · mol−1
- ^ ΔfH°, -55.19 kJ · mol−1
- ^ ΔfG°, -51.57 kJ · mol−1
- ^ S°, 111.3 J · K−1 · mol−1
- ^ Cp°, -142.3 J · K−1 · mol−1
- ^ ΔfH°, -67.8 kJ · mol−1
- ^ ΔfG°, -69.5 kJ · mol−1
- ^ S°, 96.7 J · K−1 · mol−1
- ^ Cp°, 54.06 J · K−1 · mol−1
- ^ ΔfH°, 76.44 kJ · mol−1
- ^ ΔfG°, 92.71 kJ · mol−1
- ^ S°, 144.3 J · K−1 · mol−1
- ^ Cp°, -40.2 J · K−1 · mol−1
- ^ ΔfG°, 97.56 kJ · mol−1