Tags: Chemical Compound, Chemical Substance.
Sodium sesquicarbonate (Systematic name trisodium hydrogendicarbonate) Na3H(CO3)2 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 Na3H(CO3)2·2H2O occurs in nature as the evaporite mineral trona.