There are commercially available liquid Sodium Silicate. How could we determine the Na2O, SiO2 and H2O weight proportion in liquid Na2SiO3? Is there any standard guideline for testing?
Depends on whether your product is regulated or not and by whom! Even if your liquid will not be used as a pharmaceutical I would review the USP/NF monograph for 'Dental-Type Silica' and the methods listed there.
BTW Hydrofluoric Acid (HF) will 'rot' right through glass (it is stored in plastic) and will kill you if it gets on your skin. Eventually, it will irreversibly complex the Calcium in your bones.
gas-chromatography
http://file.scirp.org/pdf/OJIC_2016042713213847.pdf
We regularly use ICP-OES to determine the Na and Si in this type of solution. The amount of water can be determined using Karl Fisher titration.
@ Marius Harmse
I thank you for your reply.
I would like to know detail - calculation, preparation and ICP test.
Thank you.
Iftekhair Bashar
I have seen your request. Just give me a few days to finalise something for you. I am observing Christmas celebrations over the next few days, and I will answer shortly afterwards.
Can you tell me about your experience as a chemist and what equipment you currently have, please? This will help with the amount of detail that I should add to the method.
Dear Marius Harmse
Thank you for your reply.
I am not a chemist, but in my research on material, I need to determine the concentration of SiO2, Na2O and H2O quantity from a source of liquid sodium silicate (commercial and waste source).
We have facilities of ICP-OES, AAS, XRD, XRF, FESEM, TGA, FTIR.
I would prefer to use instruments to determine the above other than any titration method.
I wish you a good Christmas celebration!
FTIR and ICP (for quantification of the elements). KFR or 'Loss on Drying' for water.
A halide (chloride) or sulphate might also be present as a counterion.
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