RU_KLO
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Puriying Sodium Silicate
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
Go SAFE, because stupidity and bad Luck exist.
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Maurice VD 37
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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.
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unionised
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In principle, you can purify this stuff by crystallisation.
https://en.wikipedia.org/wiki/Sodium_metasilicate
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