Abstract
WE have reported earlier1 the occurrence of a point of inflexion at pH 10.75 on the hydrolysis curve of a 0.01 M sodium silicate solution which was attributed to the formation of the trihydroxy – orthosilicate ion, but we were unable to detect with certainty a point on this curve corresponding to the final decomposition of this ion to orthosilicic acid, Si(OH)4. An investigation of the sodium silicate – ferrous hydroxide system has shed new light on this problem. It is known that controlled oxidation of ferrous hydroxide between pH 5.2 and 11.5 yields magnetite2,3, and it has also been established4 that silica prevents the formation of magnetite from solution. One could therefore expect a systematic investigation of the sodium silicate – ferrous hydroxide system over a wide pH range to assist in clarifying the behaviour of silicic acid.
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References
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KAKABADSE, G., WHINFREY, P. The Sodium Silicate – Ferrous Hydroxide System. Nature 189, 829 (1961). https://doi.org/10.1038/189829a0
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DOI: https://doi.org/10.1038/189829a0
