2NH4SCN + KMnO4 → NO↑ + MnCO3 + KSCN + (NH4)2S
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The reaction of ammonium thiocyanate and potassium permanganate yields nitrogen monoxide, manganese(II) carbonate, potassium thiocyanate, and ammonium sulfide (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 ammonium thiocyanate and potassium permanganate
General equation
- Reaction of reducing species and oxidizing species
- Reducing speciesReducing agent + Oxidizing speciesOxidizing agent ⟶ ProductOxidation product + ProductReduction product
Oxidation state of each atom
- Reaction of ammonium thiocyanate and potassium permanganate
Reactants
Chemical formula | Name | Coefficient | Type | Type in general equation |
---|---|---|---|---|
NH4SCN | Ammonium thiocyanate | 2 | Reducing | Reducing |
KMnO4 | Potassium permanganate | 1 | Oxidizing | Oxidizing |
Products
Chemical formula | Name | Coefficient | Type | Type in general equation |
---|---|---|---|---|
NO | Nitrogen monoxide | 1 | Oxidized | – |
MnCO3 | Manganese(II) carbonate | 1 | Reduced | – |
KSCN | Potassium thiocyanate | 1 | – | – |
(NH4)2S | Ammonium sulfide | 1 | – | – |
Thermodynamic changes
Changes in aqueous solution
- Reaction of ammonium thiocyanate and potassium permanganate◆
ΔrG −289.6 kJ/mol K 5.44 × 1050 pK −50.74
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 | −305.7 | −289.6 | −53.5 | – |
per 1 mol of | −152.8 | −144.8 | −26.8 | – |
per 1 mol of | −305.7 | −289.6 | −53.5 | – |
per 1 mol of | −305.7 | −289.6 | −53.5 | – |
per 1 mol of | −305.7 | −289.6 | −53.5 | – |
per 1 mol of | −305.7 | −289.6 | −53.5 | – |
per 1 mol of | −305.7 | −289.6 | −53.5 | – |
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 |
---|---|---|---|---|
NH4SCN (cr) | -78.7[1] | – | – | – |
NH4SCN (ai) | -56.07[1] | 13.40[1] | 257.7[1] | 39.7[1] |
KMnO4 (cr) | -837.2[1] | -737.6[1] | 171.71[1] | 117.57[1] |
KMnO4 (ai) | -793.8[1] | -730.5[1] | 293.7[1] | -60.2[1] |
* (cr):Crystalline solid, (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 |
---|---|---|---|---|
NO (g) | 90.25[1] | 86.55[1] | 210.761[1] | 29.844[1] |
MnCO3 (cr) natural | -894.1[1] | -816.7[1] | 85.8[1] | 81.50[1] |
MnCO3 (cr) precipitated | -883.2[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] |
(NH4)2S (ai) | -231.8[1] | -72.6[1] | 212.1[1] | – |
* (g):Gas, (cr):Crystalline solid, (ai):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°, -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°, -837.2 kJ · mol−1
- ^ ΔfG°, -737.6 kJ · mol−1
- ^ S°, 171.71 J · K−1 · mol−1
- ^ Cp°, 117.57 J · K−1 · mol−1
- ^ ΔfH°, -793.8 kJ · mol−1
- ^ ΔfG°, -730.5 kJ · mol−1
- ^ S°, 293.7 J · K−1 · mol−1
- ^ Cp°, -60.2 J · K−1 · mol−1
- ^ ΔfH°, 90.25 kJ · mol−1
- ^ ΔfG°, 86.55 kJ · mol−1
- ^ S°, 210.761 J · K−1 · mol−1
- ^ Cp°, 29.844 J · K−1 · mol−1
- ^ ΔfH°, -894.1 kJ · mol−1
- ^ ΔfG°, -816.7 kJ · mol−1
- ^ S°, 85.8 J · K−1 · mol−1
- ^ Cp°, 81.50 J · K−1 · mol−1
- ^ ΔfH°, -883.2 kJ · 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°, -231.8 kJ · mol−1
- ^ ΔfG°, -72.6 kJ · mol−1
- ^ S°, 212.1 J · K−1 · mol−1