Assertion: sodium carbonate | /r/HasProperty | sodium sulphate
Facets:
Source sentences:
text: ,silica and organic coloring matter, which consists in first preparing a brine of the standard and invariant composition of approximately 16% sodium carbonate, 14.5% of the chlorides of sodium and potassium, sodium sulphate, by stirring such brines as naturally exist on or under the surface of Owens Lake with an excess of the solid phases of sodium chloride, and sodium carbonate monohydrate or sodium carbonate decahydrate at an approximate temperature of 30 C., until solubility equilibrium is sub: stantially attained, allowing the excess of salts to settle out at the maintained temperature of approximately 30 (1., drawing olf the settled brine, then adding to the clear decanted brine a small amount of caustic alkali to maintain it sufiiciently alkaline to prevent the subsequent precipitation of silica and organic coloring matter, chilling the treated brine to such a temperature as to cause a substantial part of the sodium carbonate to crystallize out as sodium carbonate decahydrate without admixture of the crystals of sodium chloride or sodium sulphate decahydrate, removing and washing the mother liquor from such decahydrate crystals, and further purifying the sodium carbonate from the mother liquor impurities by melting up the decahydrate crystals, evaporating 011' a portion of the water from the solution so as to cause the crystallizing out of sodium carbonate monohydrate, separating the monohydrate crystals fifrom the mother liquor and washing same, and