Sciencemadness Discussion Board

Sodium thiosulfate into sulfuric acid

copperastic - 19-3-2014 at 16:40

Hi, I just had this idea (im not gonna do it because I dont have the right safety equipment) That putting Sodium thiosulfate into HCl would generate sodium chloride, sulfur, sulfur dioxide, and water. My idea is to bubble the sulfur dioxide into water making sulfuric acid. would this work?
Thanks.

bismuthate - 19-3-2014 at 16:43

No
SO2+H2O<==>H2SO3 not H2SO4

BromicAcid - 19-3-2014 at 17:15

As bismuthate said, no, you will not generate sulfuric acid. Instead you will generate sulfurous acid or an equivalent solution of sulfur dioxide in water. There are plenty of threads on making sulfuric acid on the forum, enough to entertain you for hours upon hours. Essentially you need to oxidize your sulfur dioxide further to sulfur trioxide or oxidize your solution further to sulfuric acid.

copperastic - 19-3-2014 at 17:20

oh ok thanks.

Brain&Force - 19-3-2014 at 18:46

What about dissolving sulfur dioxide in hydrogen peroxide? That should oxidize the sulfur dioxide to sulfuric acid.
I wouldn't waste thiosulfate on sulfuric acid though, because burning sulfur is a faster way to produce sulfur dioxide.

copperastic - 20-3-2014 at 03:28

oh ok brain force because i was about to buy some. What could i use sodium thiosulfate for?

bismuthate - 20-3-2014 at 03:46

Have it onhand to deal with iodine. The iodine clock reaction is fun and uses thiosulfate.

blogfast25 - 20-3-2014 at 05:55

Quote: Originally posted by copperastic  
oh ok brain force because i was about to buy some. What could i use sodium thiosulfate for?


Iodometry in neutral/alkaline conditions.

Complexation of silver (dissolving AgCl, e.g.)

[Edited on 20-3-2014 by blogfast25]

copperastic - 20-3-2014 at 12:12

sorry im new to chemistry and dont know what iodometry is.

gdflp - 20-3-2014 at 15:25

It's a method of determining iodine purity, similar to a acid base titration, because the iodine reacts with the sodium thiosulfate reduces the iodine according to the following reaction 2Na2S2O3 + I2 --> Na2S4O6 + 2NaI

[Edited on 20-3-2014 by gdflp]