RU_KLO - 21-11-2023 at 07:13
I want to start experimenting with silicates.
I dont want to use HF, so the path I see is to use Sodium Silicate,
but from wiki, there could be a problem from excess of alkali.
How to remove excess of alkali?
(If HCl, how to remove NaCl then?)
Which Ph should a Sodium Silicate solution have?
or maybe add an excess of Silica gel and try to react all NaOH?
Thanks
Maurice VD 37 - 1-12-2023 at 08:03
Solution of sodium silicate are always hydrolyzed. If by chance some sodium silicate is supposed to be pure in water, it will quickly hydrolyze and
produce some silicic acid in a spontaneous reaction like :
Na2SiO3 + 2 H2O --> 2 NaOH + H2SiO3
This reaction is an equilibrium so that sodium silicate can never be pure in solution.
unionised - 2-12-2023 at 03:46
In principle, you can purify this stuff by crystallisation.
https://en.wikipedia.org/wiki/Sodium_metasilicate