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Sodium sesquicarbonate Na3H2 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 equimolar mixture of those two salts, with whatever water of hydration the sodium carbonate includes, supplied as a powder.
The dihydrate, Na3H2 · 2H2O, occurs in nature as the evaporite mineral trona.
Due to concerns about the toxicity of borax which was withdrawn as a cleaning and laundry product, sodium sesquicarbonate is sold in the European Union as "Borax substitute". It is also known as one of the E number food additives E500.
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