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Sodium sesquicarbonate

Chemical compound
Sodium sesquicarbonate 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... Wikipedia
Chemical formula: Na3H(CO3)2·2H2O
Molar mass: 189.99 g/mol
Solubility in water: dihydrate 13 g/100 mL (0 °C); 42 g/100 mL (100 °C)
Density: 2.112 g/cm3 (dihydrate)
Appearance: white, needle-like
Crystal structure: monoclinic (dihydrate)
PubChem CID: 10791