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| Names | |
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| IUPAC name Sodium manganate(VII) | |
| Other names Sodium permanganate, permanganate of sodium | |
| Identifiers | |
3D model (JSmol) | |
| ChemSpider |
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| ECHA InfoCard | 100.030.215 |
| RTECS number |
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| Properties | |
| NaMnO4 | |
| Molar mass | 141.9254 g/mol 159.94 g/mol (monohydrate) |
| Appearance | Red solid |
| Density | 1.972 g/cm3 (monohydrate) |
| Melting point | 36 °C (97 °F; 309 K) (170 °C for trihydrate) |
| 90 g/100 mL | |
| Hazards | |
| Occupational safety and health (OHS/OSH): | |
Main hazards | Oxidizer |
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa). | |
Sodium permanganate is theinorganic compound with the formulaNaMnO4. It is closely related to the more commonly encounteredpotassium permanganate, but it is generally less desirable, because it is more expensive to produce. It is mainly available as themonohydrate. This salt absorbs water from the atmosphere and has a low melting point. Being about 15 times more soluble than KMnO4, sodium permanganate finds some applications where very high concentrations of MnO4− are sought.
Sodium permanganate cannot be prepared analogously to the route to KMnO4 because the required intermediatemanganate salt, Na2MnO4, does not form. Thus less direct routes are used including conversion from KMnO4.[1]
Sodium permanganate behaves similarly topotassium permanganate. It dissolves readily in water to give deep purple solutions, evaporation of which gives prismatic purple-black glistening crystals of the monohydrate NaMnO4·H2O. The potassium salt does not form ahydrate. Because of itshygroscopic nature, it is less useful inanalytical chemistry than its potassium counterpart.
It can be prepared by the reaction of manganese dioxide with sodium hypochlorite:
Because of its high solubility, its aqueous solutions are used as a drilled hole debris remover and etchant inprinted circuitry, with a limited utility though.[1] It is gaining popularity in water treatment for taste, odor, andzebra musselcontrol.[2] TheV-2 rocket used it in combination withhydrogen peroxide to drive a steamturbopump.[3]
As an oxidizer, sodium permanganate is used inenvironmental remediation of soil and groundwater contaminated with chlorinated solvents using the remediation technology in situ chemical oxidation, also referred to as ISCO.[4]
