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Author: Subject: Sodium Thiosulfate synthesis or aquisition
HNO3
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[*] posted on 3-1-2005 at 21:12
Sodium Thiosulfate synthesis or aquisition

After a bromine production went terribly wrong, I neutralized the resulting solutions with about 15g of my 30g of sodium thio. And since I'm not going to give up on bromine so easily...;) I need to make or aquire some sodium thio and I don't know how (seeing as my Encylopedia Britanica doesn't have any info).



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[*] posted on 3-1-2005 at 23:21


Here where I live sodium thiosulfate can be bought OTC for removing the color from decolorized clothes.



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S.C. Wack
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[*] posted on 3-1-2005 at 23:53


Boil Na2SO3 with S. Or start with bisulfite if this is preferable, adding Na2CO3 to give the sulfite.
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[*] posted on 4-1-2005 at 16:55


Org: you wouldn't have a brand name, would you?
S.C.Wack: Maybe I'm just dumb but I con't remember seeing any OTC sources of sodium sulfite.



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[*] posted on 4-1-2005 at 18:26


Sodium metabisulphite is used in home winemaking. One mole hydrolyses to 2 of sodium hydrogen sulphite.
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[*] posted on 4-1-2005 at 20:16


You could use the reaction between S and hot NaOH solution:
(unbalanced) NaOH + S -> Na2S2O3 + Na2Sx



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[*] posted on 5-1-2005 at 04:43
Use this

2NaHS + 2O2 -----> Na2S2O3 + H2O

good luck
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[*] posted on 5-1-2005 at 15:18


Sodium sulphite Na2SO3 , or the bisulphite is easily made by bubbling SO2 (i.e. from sulphur burning) through NaOH. Once the solution stops absorbing SO2, you will have a NaHSO3 (bisulphite) solution. This you can turn to the sulphite Na2SO3 by adding a calculated amount of NaOH (which you know from the amount of NaOH used to bubble SO2 through it).

Then, to make the thiosulphate, boil this Na2SO3 solution with excess solid sulphur to obtain the thiosulphate.



[Edited on 6-1-2005 by chemoleo]



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[*] posted on 5-1-2005 at 15:40


Unfortunately, I don't have a scale and won't have one for ~5 months.:( I do have good volume measuring equipment, though.:D



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[*] posted on 5-1-2005 at 15:42


In the interests of using cheaper and more available supplies, couldn't we use Sodium Carbonate (washing soda) or even Sodium Bicarbonate (baking soda) and bubble the SO2 through them? Then the resultant Sodium Sulfite could be boiled with the Sulfur. The SO2 makes a fairly strong acid, that should free CO2 from Carbonates.



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[*] posted on 5-1-2005 at 16:10


Isn't sodium thiosulfate the main ingredient in many photographic development fixers? Unless you need high purity, try a photographic shop.
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