2Na + KSCN → Na2S + KCN
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- Reaction of and potassium thiocyanate
The reaction of and potassium thiocyanate yields sodium sulfide and potassium cyanide (Other reactions are here). This reaction is an oxidation-reduction reaction and is classified as follows:
Table of contents
Reaction data
Chemical equation
- Reaction of and potassium thiocyanate
General equation
- Reaction of reducing species and reducible species
- Reducing speciesReducing agent + Reducible speciesOxidizing agent ⟶ ProductOxidation product + ProductReduction product
Oxidation state of each atom
- Reaction of and potassium thiocyanate
Reactants
Chemical formula | Name | Coefficient | Type | Type in general equation |
---|---|---|---|---|
2 | Reducing | Reducing | ||
KSCN | Potassium thiocyanate | 1 | Oxidizing | Reducible |
Products
Chemical formula | Name | Coefficient | Type | Type in general equation |
---|---|---|---|---|
Na2S | Sodium sulfide | 1 | Oxidized | – |
KCN | Potassium cyanide | 1 | Reduced | – |
Thermodynamic changes
Changes in standard condition
- Reaction of and potassium thiocyanate◆
ΔrG −273.4 kJ/mol K 7.90 × 1047 pK −47.90
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 | −277.6 | −273.4 | −14.5 | – |
−138.8 | −136.7 | −7.25 | – | |
per 1 mol of | −277.6 | −273.4 | −14.5 | – |
per 1 mol of | −277.6 | −273.4 | −14.5 | – |
per 1 mol of | −277.6 | −273.4 | −14.5 | – |
Changes in aqueous solution
- Reaction of and potassium thiocyanate◆
ΔrG −358.4 kJ/mol K 6.15 × 1062 pK −62.79
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 | −373.1 | −358.4 | −49.4 | – |
−186.6 | −179.2 | −24.7 | – | |
per 1 mol of | −373.1 | −358.4 | −49.4 | – |
per 1 mol of | −373.1 | −358.4 | −49.4 | – |
per 1 mol of | −373.1 | −358.4 | −49.4 | – |
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 |
---|---|---|---|---|
(cr) | 0[1] | 0[1] | 51.21[1] | 28.24[1] |
(g) | 107.32[1] | 76.761[1] | 153.712[1] | 20.786[1] |
KSCN (cr) | -200.16[1] | -178.31[1] | 124.26[1] | 88.53[1] |
KSCN (ai) | -175.94[1] | -190.56[1] | 246.9[1] | -18.4[1] |
* (cr):Crystalline solid, (g):Gas, (ai):Ionized aqueous solution
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 |
---|---|---|---|---|
Na2S (cr) | -364.8[1] | -349.8[1] | 83.7[1] | – |
Na2S (ai) | -447.3[1] | -438.1[1] | 103.3[1] | – |
Na2S (cr) 4.5 hydrate | -1725.9[1] | – | – | – |
Na2S (cr) 5 hydrate | -1886.6[1] | – | – | – |
Na2S (cr) 9 hydrate | -3074.0[1] | – | – | – |
KCN (cr) | -113.0[1] | -101.86[1] | 128.49[1] | 66.27[1] |
KCN (g) | 90.8[1] | 64.17[1] | 261.90[1] | 52.34[1] |
KCN (ai) | -101.7[1] | -110.9[1] | 196.6[1] | – |
* (cr):Crystalline solid, (ai):Ionized aqueous solution, (g):Gas
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)
- ^ ΔfH°, 0 kJ · mol−1
- ^ ΔfG°, 0 kJ · mol−1
- ^ S°, 51.21 J · K−1 · mol−1
- ^ Cp°, 28.24 J · K−1 · mol−1
- ^ ΔfH°, 107.32 kJ · mol−1
- ^ ΔfG°, 76.761 kJ · mol−1
- ^ S°, 153.712 J · K−1 · mol−1
- ^ Cp°, 20.786 J · K−1 · mol−1
- ^ ΔfH°, -200.16 kJ · mol−1
- ^ ΔfG°, -178.31 kJ · mol−1
- ^ S°, 124.26 J · K−1 · mol−1
- ^ Cp°, 88.53 J · K−1 · mol−1
- ^ ΔfH°, -175.94 kJ · mol−1
- ^ ΔfG°, -190.56 kJ · mol−1
- ^ S°, 246.9 J · K−1 · mol−1
- ^ Cp°, -18.4 J · K−1 · mol−1
- ^ ΔfH°, -364.8 kJ · mol−1
- ^ ΔfG°, -349.8 kJ · mol−1
- ^ S°, 83.7 J · K−1 · mol−1
- ^ ΔfH°, -447.3 kJ · mol−1
- ^ ΔfG°, -438.1 kJ · mol−1
- ^ S°, 103.3 J · K−1 · mol−1
- ^ ΔfH°, -1725.9 kJ · mol−1
- ^ ΔfH°, -1886.6 kJ · mol−1
- ^ ΔfH°, -3074.0 kJ · mol−1
- ^ ΔfH°, -113.0 kJ · mol−1
- ^ ΔfG°, -101.86 kJ · mol−1
- ^ S°, 128.49 J · K−1 · mol−1
- ^ Cp°, 66.27 J · K−1 · mol−1
- ^ ΔfH°, 90.8 kJ · mol−1
- ^ ΔfG°, 64.17 kJ · mol−1
- ^ S°, 261.90 J · K−1 · mol−1
- ^ Cp°, 52.34 J · K−1 · mol−1
- ^ ΔfH°, -101.7 kJ · mol−1
- ^ ΔfG°, -110.9 kJ · mol−1
- ^ S°, 196.6 J · K−1 · mol−1