sodium silicate

noun

Definition of sodium silicate 

: any of various water-soluble substances obtained in the form of crystals, glasses, powders, or aqueous solutions usually by melting silica with a sodium compound (such as sodium carbonate or sodium hydroxide): such as

a or sodium orthosilicate : a corrosive crystalline substance regarded as a salt Na4SiO4 or 2Na2O.SiO2 of orthosilicic acid or as a mixture of sodium metasilicate with sodium hydroxide and used chiefly in heavy-duty cleaning compositions

b or sodium metasilicate : a crystalline salt Na2SiO3 or Na2O.SiO2 either in the anhydrous or hydrated form used chiefly as a detergent

c or sodium sesquisilicate : a corrosive crystalline salt regarded as intermediate in composition between sodium orthosilicate and sodium metasilicate and used in heavy-duty cleaning compositions not used systematically

d : water glass

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