Oxygen → Orthosilicic acid

Participants

Reaction Steps

About 15 parts by weight of granular sodium metasilicate pentahydrate are slowly added to about 8 parts by weight of concentrated sulfuric acid while agitating and keeping the temperature below 100° C. The reaction takes place under ambient pressure; oxygen is evolved and the reaction is complete in 1 to 2 hours, thereby producing a white granular silicic acid compound and sodium sulfate. The mixture is washed with water, filtered to remove the salt and water, thereby recovering the silicic acid compound. The silicic acid compound is air dried at 25° to 75° C.

Provenance & Evidence