just wanted to ask if anyone using 3% hydrogen peroxide to remove chlorine from your strike/sparge water? If yes how many ml/l or gallon? Thank you.
Congratulations, you made me pull out my ancient chemistry knowledge and periodic table data. (I'm a chemical engineer by degree, but that was more than 20 years ago. Hope I still know what the heck I'm doing!)
Based on molecular weights and the fact that sodium hypochlorite reacts with hydrogen peroxide thusly:
NaOCl + H2O2 --> HCl + H2O + O2
It appears that you would need 34/74.5 = 45.6% as much hydrogen peroxide as the chlorinated water, assuming both are at a concentration of 3%. But I doubt water contains 3% sodium hypochlorite. Looking that up... it appears that a common municipal water system actually doses the sodium hypochlorite not at 3% but rather about 0.5%. So that is 1/6 as much as I thought. So that's 45.6/6 = 7.6% as much hydrogen peroxide you will need to neutralize the hypochlorite compared to the volume of chlorinated water. Or volumetrically that's 76 ml per liter of water, or would be about 10 ounces per gallon.
Kind of a lot in my opinion. But I understand the reaction is very fast, virtually instantaneous. You might even see oxygen visibly bubbling out upon mixing (I haven't tried it). Don't have any open flames nearby, just in case. But it should definitely work.
Hope I'm right. Interesting idea. Thanks for the question! I might have to give this a try sometime.