sodium sesquicarbonate

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A white crystalline hydrated double salt, Na2CO3.NaHCO3.2H2O, soluble in water but less alkaline than sodium carbonate; r.d. 2.12; decomposes on heating. It may be prepared by crystallizing equimolar quantities of the constituent materials; it also occurs naturally as trona and in Searles Lake brines. It is widely used as a detergent and soap builder and, because of its mild alkaline properties, as a water-softening agent and bath-salt base. See also sodium carbonate.

Subjects: Chemistry.

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