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Electrochemical Properties of Silicic Acid Sols

Nature volume 155, pages 8586 (20 January 1945) | Download Citation

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Abstract

THE properties of silicic acid sols have been studied by several investigators1–10. Differences of opinion1,2,3 have been expressed as to whether the sols possess any intrinsic acid character. In a number of publications from this laboratory the interactions of silicic acid sols with bases11,12,13,14, neutral salts15,16 and acids17,18 have been discussed. The sols even after purification by prolonged electro-dialysis have free acidities of the order of 10–4 N. Their ultra-filtrates have a practically neutral reaction showing that mobile H+ ions associated with the continued buffer action beyond the first inflexion point takes place, and a second inflexion (Fig. 2) between PH 11·0 and 11·7 corresponding to the formation of NaHSiO3 is observed13. An inflexion at pH 11·8 in the titration curves of silicic acid sol with concentrated alkali has been observed by Tread-well and Kónig4.

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Affiliations

  1. C.B.E., University College of Science and Technology, Calcutta

    • J. N. MUKHERJEE
  2. University College of Science and Technology, Calcutta

    • B. CHATTERJEE

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https://doi.org/10.1038/155085a0

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