Sodium Sesquicarbonate
Title: Sodium Sesquicarbonate
CAS Registry Number: 533-96-0
Additional Names: Urao; trona
Molecular Formula: C2HNa3O6
Molecular Weight: 190.00
Percent Composition: C 12.64%, H 0.53%, Na 36.30%, O 50.52%
Line Formula: Na2CO3.NaHCO3
Literature References: Found in nature as the dihydrate, e.g., Owens Lake, Searles Lake (U.S.A.); Lake Magadi (Kenya). Produced on a large scale from sodium carbonate and a slight excess of sodium bicarbonate: Schenk in Winnacker-Weingaertner, Chemische Technologie vol. I (München, 1950) p 427.
 
Derivative Type: Dihydrate
Properties: Monoclinic needles, d 2.112. Crystals are stable in air. Soly in water (g/100 ml) at 0°: 13; at 100°: 42. Aq solns are mildly alkaline. pH of 0.1M soln = 10.1.
Density: d 2.112
 
CAUTION: Irritating to skin, mucous membranes.
Use: Chiefly in laundering in conjunction with soap.

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