Sodium sesquicarbonate

Sodium sesquicarbonate

Sodium sesquicarbonate (Systematic name trisodium hydrogendicarbonate) Na3H(CO3)2, which is a double salt of sodium bicarbonate and sodium carbonate, and has a needle-like crystal structure. However, the term is also applied to an [http://en.wiktionary.org/wiki/equimolar equimolar] mixture of those two salts, with whatever water of hydration the sodium carbonate includes, supplied as a powder.

The dihydrate, Na3H(CO3)2·2H20, occurs in nature as the evaporite mineral trona

Uses

Sodium sesquicarbonate is used in bath salts.

Sodium sesquicarbonate is used in the archaeological conservation of objects made of copper and copper alloys that have been corroded by salt water. Treatment with sodium sesquicarbonate removes copper chlorides from the corroded layer; if these were not removed the object would continue to corrode ("copper disease") while exposed to air.

It is also used as a precipitating water softener, which combines with hard water minerals (calcium- and magnesium-based minerals) to form an insoluble precipitate, removing these hardness minerals from the water. [http://www.cleaning101.com/laundry/fact/fact_sheet4.cfm] It is the carbonate moiety which forms the precipitate, the bicarbonate being included to moderate the material's alkalinity.


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  • sodium sesquicarbonate — noun : a crystalline acid carbonate Na2CO3.NaHCO3.2H2O or Na3H(CO3)2.2H2O that occurs in nature as trona or is made synthetically from sodium carbonate and sodium bicarbonate and is used chiefly as a detergent not used systematically …   Useful english dictionary

  • sesquicarbonate — |seskwə̇+ noun Etymology: sesqui + carbonate : a salt that is neither a simple normal carbonate nor a simple bicarbonate but in some cases (as sodium sesquicarbonate) a combination of the two not used systematically * * * /ses kwi kahr beuh nayt …   Useful english dictionary

  • SODIUM — Le sodium est le plus courant des éléments alcalins. Son nom dérive de l’arabe soda , qui désignait le mélange de carbonates alcalins extrait des cendres de végétaux. Le symbole Na vient de son appellation allemande Natrium , qui dérive de… …   Encyclopédie Universelle

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  • alkali — /al keuh luy /, n., pl. alkalis, alkalies, adj. n. 1. Chem. a. any of various bases, the hydroxides of the alkali metals and of ammonium, that neutralize acids to form salts and turn red litmus paper blue. b. any of various other more or less… …   Universalium

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