MgBr2 + 4KMnO4 + 4H+ → Mg2+ + 2KBrO3 + 4MnO2 + 2K+ + 2H2O
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- Reaction of magnesium bromide and potassium permanganate under acidic condition
- MgBr2Magnesium bromide + 4KMnO4Potassium permanganate + 4H+Hydrogen ionMg2+Magnesium ion + 2KBrO3Potassium bromate + 4MnO2Manganese(IV) oxide + 2K+Potassium ion + 2H2OWater⟶
The reaction of magnesium bromide, potassium permanganate, and hydrogen ion yields magnesium ion, potassium bromate, manganese(IV) oxide, potassium ion, and water (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 magnesium bromide and potassium permanganate under acidic condition
- MgBr2Magnesium bromide + 4KMnO4Potassium permanganate + 4H+Hydrogen ionMg2+Magnesium ion + 2KBrO3Potassium bromate + 4MnO2Manganese(IV) oxide + 2K+Potassium ion + 2H2OWater⟶
General equation
- Reaction of hardly oxidizable species and oxidizing species under acidic condition
- Hardly oxidizable speciesReducing agent + Oxidizing speciesOxidizing agent + H+Non-redox agent ⟶ ProductOxidation product + ProductReduction product + H2ONon-redox product
Oxidation state of each atom
- Reaction of magnesium bromide and potassium permanganate under acidic condition
Reactants
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| MgBr2 | Magnesium bromide | 1 | Reducing | Hardly oxidizable |
| KMnO4 | Potassium permanganate | 4 | Oxidizing | Oxidizing under acidic condition |
| H+ | Hydrogen ion | 4 | – | Hydrogen ion |
Products
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| Mg2+ | Magnesium ion | 1 | – | – |
| KBrO3 | Potassium bromate | 2 | Oxidized | – |
| MnO2 | Manganese(IV) oxide | 4 | Reduced | – |
| K+ | Potassium ion | 2 | – | – |
| H2O | Water | 2 | – | Water |
Thermodynamic changes
Changes in standard condition
- Reaction of magnesium bromide and potassium permanganate under acidic condition◆
ΔrG −300.8 kJ/mol K 4.99 × 1052 pK −52.70
| 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 | −377.2 | −300.8 | −254.2 | – |
per 1 mol of | −377.2 | −300.8 | −254.2 | – |
per 1 mol of | −94.30 | −75.20 | −63.55 | – |
per 1 mol of Hydrogen ion | −94.30 | −75.20 | −63.55 | – |
per 1 mol of Magnesium ion | −377.2 | −300.8 | −254.2 | – |
per 1 mol of | −188.6 | −150.4 | −127.1 | – |
per 1 mol of | −94.30 | −75.20 | −63.55 | – |
per 1 mol of Potassium ion | −188.6 | −150.4 | −127.1 | – |
per 1 mol of | −188.6 | −150.4 | −127.1 | – |
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 |
|---|---|---|---|---|
| MgBr2 (cr) | -524.3[1] | -503.8[1] | 117.2[1] | – |
| MgBr2 (g) | -309.6[1] | – | – | – |
| MgBr2 (ai) | -709.94[1] | -662.7[1] | 26.8[1] | – |
| MgBr2 (cr) 6 hydrate | -2410.0[1] | -2055.7[1] | 397[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] |
| H+ (g) | 1536.202[1] | – | – | – |
| H+ (ao) | 0[1] | 0[1] | 0[1] | 0[1] |
* (cr):Crystalline solid, (g):Gas, (ai):Ionized aqueous solution, (ao):Un-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 |
|---|---|---|---|---|
| Mg2+ (g) | 2348.504[1] | – | – | – |
| Mg2+ (ao) | -466.85[1] | -454.8[1] | -138.1[1] | – |
| KBrO3 (cr) | -360.24[1] | -271.16[1] | 149.16[1] | 105.19[1] |
| KBrO3 (ai) | -319.45[1] | -264.67[1] | 264.22[1] | – |
| MnO2 (cr) | -520.03[1] | -465.14[1] | 53.05[1] | 54.14[1] |
| MnO2 (am) precipitated | -502.5[1] | – | – | – |
| K+ (g) | 514.26[1] | – | – | – |
| K+ (ao) | -252.38[1] | -283.27[1] | 102.5[1] | 21.8[1] |
| H2O (cr) | – | – | – | – |
| H2O (l) | -285.830[1] | -237.129[1] | 69.91[1] | 75.291[1] |
| H2O (g) | -241.818[1] | -228.572[1] | 188.825[1] | 33.577[1] |
* (g):Gas, (ao):Un-ionized aqueous solution, (cr):Crystalline solid, (ai):Ionized aqueous solution, (am):Amorphous solid, (l):Liquid
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°, -524.3 kJ · mol−1
- ^ ΔfG°, -503.8 kJ · mol−1
- ^ S°, 117.2 J · K−1 · mol−1
- ^ ΔfH°, -309.6 kJ · mol−1
- ^ ΔfH°, -709.94 kJ · mol−1
- ^ ΔfG°, -662.7 kJ · mol−1
- ^ S°, 26.8 J · K−1 · mol−1
- ^ ΔfH°, -2410.0 kJ · mol−1
- ^ ΔfG°, -2055.7 kJ · mol−1
- ^ S°, 397. 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°, 1536.202 kJ · mol−1
- ^ ΔfH°, 0 kJ · mol−1
- ^ ΔfG°, 0 kJ · mol−1
- ^ S°, 0 J · K−1 · mol−1
- ^ Cp°, 0 J · K−1 · mol−1
- ^ ΔfH°, 2348.504 kJ · mol−1
- ^ ΔfH°, -466.85 kJ · mol−1
- ^ ΔfG°, -454.8 kJ · mol−1
- ^ S°, -138.1 J · K−1 · mol−1
- ^ ΔfH°, -360.24 kJ · mol−1
- ^ ΔfG°, -271.16 kJ · mol−1
- ^ S°, 149.16 J · K−1 · mol−1
- ^ Cp°, 105.19 J · K−1 · mol−1
- ^ ΔfH°, -319.45 kJ · mol−1
- ^ ΔfG°, -264.67 kJ · mol−1
- ^ S°, 264.22 J · K−1 · mol−1
- ^ ΔfH°, -520.03 kJ · mol−1
- ^ ΔfG°, -465.14 kJ · mol−1
- ^ S°, 53.05 J · K−1 · mol−1
- ^ Cp°, 54.14 J · K−1 · mol−1
- ^ ΔfH°, -502.5 kJ · mol−1
- ^ ΔfH°, 514.26 kJ · mol−1
- ^ ΔfH°, -252.38 kJ · mol−1
- ^ ΔfG°, -283.27 kJ · mol−1
- ^ S°, 102.5 J · K−1 · mol−1
- ^ Cp°, 21.8 J · K−1 · mol−1
- ^ ΔfH°, -285.830 kJ · mol−1
- ^ ΔfG°, -237.129 kJ · mol−1
- ^ S°, 69.91 J · K−1 · mol−1
- ^ Cp°, 75.291 J · K−1 · mol−1
- ^ ΔfH°, -241.818 kJ · mol−1
- ^ ΔfG°, -228.572 kJ · mol−1
- ^ S°, 188.825 J · K−1 · mol−1
- ^ Cp°, 33.577 J · K−1 · mol−1