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Sodium permanganate
Identifiers
CAS number 10101-50-5
PubChem 23673458
RTECS number SD6650000
Properties
Molecular formula 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

Boiling point

100 °C

Solubility in water 900 g/L
Hazards
Main hazards Oxidizer
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Sodium permanganate is the inorganic compound with the formula NaMnO4. It is closely related to the more commonly encountered potassium permanganate, but it is generally less desirable, because it is more expensive, absorbs water from the atmosphere, and low melting. Being about 15x more soluble than KMnO4, sodium permanganate finds some applications where very high concentrations of MnO4- are sought.

Preparation and properties

Sodium permanganate cannot be prepared analogously to the route to KMnO4 because the required intermediate manganate salt, Na2MnO4, does not form. Thus less direct routes are used including conversion from KMnO4.[1]

Sodium permanganate behaves similarly to potassium 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 a hydrate. Because of its hygroscopic nature, it is less useful in analytical chemistry than its potassium counterpart.

Applications

Because of its high solubility, its aqueous solutions are used as etchants in printed circuitry.[1]

References

  1. ^ a b Arno H. Reidies "Manganese Compounds" in Ullmann's Encyclopedia of Industrial Chemistry, 2002, Wiley-VCH, Weinheim. doi:10.1002/14356007.a16_123
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Simple English

Sodium permanganate is a chemical compound. Its chemical formula is NaMnO4. It contains sodium and permanganate ions.

Contents

Properties

It is a purple-black crystalline solid. It can dissolve in water to make a bright pink solution. It dissolves in water more than potassium permanganate. It is more expensive than potassium permanganate. It also absorbs water from the air. It is a strong oxidizing agent.

Preparation

It cannot be made in the way that potassium permanganate is made because sodium manganate is not made. It can be made by reacting pure manganese(IV) oxide with sodium hypochlorite. It can also be made by reacting potassium permanganate with certain sodium compounds.

Uses

It can be used to make circuit boards.

Safety

Permanganates are toxic. They are also strong oxidizing agents and should be kept away from things that can burn.

See also


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