Sodium Sesqui Carbonate, alias “Bicarbonate Sodium,” is a chemical with various functions, including being used in bath salts, medicine, tanned leather, water softening, swimming pools, and mineral water recuperation. Sodium Sesqui Carbonate is sodium of sodium carbonate and semi-alkali. Its molecular formula is NA2CO3 · NAHCO3 · 2H2O. When in a suitable environment, Sodium Sesqui Carbonate crystallizes as white needle-shaped crystals, sheet-like, or crystalline powder.