4Na + 3NH4SCN → 2NaSCN + Na2S + 4NH3↑ + C
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- Reaction of and ammonium thiocyanate
The reaction of and ammonium thiocyanate yields sodium thiocyanate, sodium sulfide, ammonia, and (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 ammonium 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 ammonium thiocyanate
Reactants
Chemical formula | Name | Coefficient | Type | Type in general equation |
---|---|---|---|---|
4 | Reducing | Reducing | ||
NH4SCN | Ammonium thiocyanate | 3 | Oxidizing | Reducible |
Products
Chemical formula | Name | Coefficient | Type | Type in general equation |
---|---|---|---|---|
NaSCN | Sodium thiocyanate | 2 | Oxidized | – |
Na2S | Sodium sulfide | 1 | Oxidized | – |
NH3 | Ammonia | 4 | – | – |
1 | Reduced | – |
Thermodynamic changes
Changes in standard condition (1)
- Reaction of and ammonium thiocyanate
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 | −654.1 | – | – | – |
−163.5 | – | – | – | |
per 1 mol of | −218.0 | – | – | – |
per 1 mol of | −327.1 | – | – | – |
per 1 mol of | −654.1 | – | – | – |
per 1 mol of | −163.5 | – | – | – |
−654.1 | – | – | – |
Changes in standard condition (2)
- Reaction of and ammonium thiocyanate
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 | −652.2 | – | – | – |
−163.1 | – | – | – | |
per 1 mol of | −217.4 | – | – | – |
per 1 mol of | −326.1 | – | – | – |
per 1 mol of | −652.2 | – | – | – |
per 1 mol of | −163.1 | – | – | – |
−652.2 | – | – | – |
Changes in aqueous solution (1)
- Reaction of and ammonium thiocyanate◆
ΔrG −882.5 kJ/mol K 4.05 × 10154 pK −154.61
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 | −790.9 | −882.5 | 307.5 | – |
−197.7 | −220.6 | 76.88 | – | |
per 1 mol of | −263.6 | −294.2 | 102.5 | – |
per 1 mol of | −395.4 | −441.3 | 153.8 | – |
per 1 mol of | −790.9 | −882.5 | 307.5 | – |
per 1 mol of | −197.7 | −220.6 | 76.88 | – |
−790.9 | −882.5 | 307.5 | – |
Changes in aqueous solution (2)
- Reaction of and ammonium thiocyanate◆
ΔrG −922.7 kJ/mol K 4.47 × 10161 pK −161.65
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 | −927.6 | −922.7 | −17.1 | – |
−231.9 | −230.7 | −4.28 | – | |
per 1 mol of | −309.2 | −307.6 | −5.70 | – |
per 1 mol of | −463.8 | −461.4 | −8.55 | – |
per 1 mol of | −927.6 | −922.7 | −17.1 | – |
per 1 mol of | −231.9 | −230.7 | −4.28 | – |
−927.6 | −922.7 | −17.1 | – |
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] |
NH4SCN (cr) | -78.7[1] | – | – | – |
NH4SCN (ai) | -56.07[1] | 13.40[1] | 257.7[1] | 39.7[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 |
---|---|---|---|---|
NaSCN (cr) | -170.50[1] | – | – | – |
NaSCN (ai) | -163.68[1] | -169.18[1] | 203.3[1] | 6.3[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] | – | – | – |
NH3 (g) | -46.11[1] | -16.45[1] | 192.45[1] | 35.06[1] |
NH3 (ao) | -80.29[1] | -26.50[1] | 111.3[1] | – |
(cr) graphite | 0[1] | 0[1] | 5.740[1] | 8.527[1] |
(cr) diamond | 1.895[1] | 2.900[1] | 2.377[1] | 6.113[1] |
(g) | 716.682[1] | 671.257[1] | 158.096[1] | 20.838[1] |
* (cr):Crystalline solid, (ai):Ionized aqueous solution, (g):Gas, (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)
- ^ 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°, -78.7 kJ · mol−1
- ^ ΔfH°, -56.07 kJ · mol−1
- ^ ΔfG°, 13.40 kJ · mol−1
- ^ S°, 257.7 J · K−1 · mol−1
- ^ Cp°, 39.7 J · K−1 · mol−1
- ^ ΔfH°, -170.50 kJ · mol−1
- ^ ΔfH°, -163.68 kJ · mol−1
- ^ ΔfG°, -169.18 kJ · mol−1
- ^ S°, 203.3 J · K−1 · mol−1
- ^ Cp°, 6.3 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°, -46.11 kJ · mol−1
- ^ ΔfG°, -16.45 kJ · mol−1
- ^ S°, 192.45 J · K−1 · mol−1
- ^ Cp°, 35.06 J · K−1 · mol−1
- ^ ΔfH°, -80.29 kJ · mol−1
- ^ ΔfG°, -26.50 kJ · mol−1
- ^ S°, 111.3 J · K−1 · mol−1
- ^ ΔfH°, 0 kJ · mol−1
- ^ ΔfG°, 0 kJ · mol−1
- ^ S°, 5.740 J · K−1 · mol−1
- ^ Cp°, 8.527 J · K−1 · mol−1
- ^ ΔfH°, 1.895 kJ · mol−1
- ^ ΔfG°, 2.900 kJ · mol−1
- ^ S°, 2.377 J · K−1 · mol−1
- ^ Cp°, 6.113 J · K−1 · mol−1
- ^ ΔfH°, 716.682 kJ · mol−1
- ^ ΔfG°, 671.257 kJ · mol−1
- ^ S°, 158.096 J · K−1 · mol−1
- ^ Cp°, 20.838 J · K−1 · mol−1