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| Lowering the PH in a system http://byap.backyardmagazines.com/forum/viewtopic.php?f=1&t=2729 |
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| Author: | Aussieponic [ Jan 16th, '08, 13:41 ] |
| Post subject: | Lowering the PH in a system |
Does any on know if hydrocloric acid is bad for plans and fish to bring down the ph in a system? I have see somewhere of sulfuric acid being used to lower ph but not hydrocloric. AP |
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| Author: | veggie boy [ Jan 16th, '08, 13:46 ] |
| Post subject: | |
How high is your pH AP? |
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| Author: | Aussieponic [ Jan 16th, '08, 13:55 ] |
| Post subject: | Re: Lowering the PH in a system |
VB PH 8.2 Ap |
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| Author: | KudaPucat [ Jan 16th, '08, 14:01 ] |
| Post subject: | |
Hydrochloric acid would split to H and Cl ions (I forget the polarities) Cl being chlorine ions would have to be bad for one's fish I would imagine? Being that we take such pains to remove chlorine from our makeup water? Chemistry was never KP's strong suit |
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| Author: | RupertofOZ [ Jan 16th, '08, 14:19 ] |
| Post subject: | |
Lemon juice and vinegar are safe alternatives. |
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| Author: | steem [ Jan 16th, '08, 14:34 ] |
| Post subject: | |
KP, I think I stuffed up by raising concerns in a previous thread  ...not much wrong with Cl- ions in water, depending on the concentration...after all that's what you get when you dissolve sodium chloride in water 
Doesn't mean I think it's safe, but Cl ions are not as bad as they sound. |
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| Author: | veggie boy [ Jan 16th, '08, 14:41 ] |
| Post subject: | |
Yep - I'd be inclined to use diluted hydrochloric acid. AP - if adding before your fish even arrive - then any Cl ions (albeit probably at safe levels anyway) will have burnt off by the time the fish come. If still concerned - you can always add some neutraliser. |
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| Author: | steve [ Jan 16th, '08, 17:37 ] |
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see my post in monyas farm thread.............. http://backyardaquaponics.com/forum/vie ... 003#102003 |
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| Author: | steve [ Jan 16th, '08, 17:53 ] |
| Post subject: | |
for the record, common salt is also an ionic bonded compound and dissasociates in to Na+ and Cl- in solution..................... not the same as having Cl dissolved in water which forms underchloric acid (HOCl) (i think there is a more common name............. |
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| Author: | steve [ Jan 16th, '08, 17:54 ] |
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for anyone that is interested; How does chlorine disinfection work? Chlorine kills pathogens such as bacteria and viruses by breaking the chemical bonds in their molecules. Disinfectants that are used for this purpose consist of chlorine compounds which can exchange atoms with other compounds, such as enzymes in bacteria and other cells. When enzymes come in contact with chlorine, one or more of the hydrogen atoms in the molecule are replaced by chlorine. This causes the entire molecule to change shape or fall apart. When enzymes do not function properly, a cell or bacterium will die. When chlorine is added to water, underchloric acids form: Cl2 + H2O -> HOCl + H+ + Cl- Depending on the pH value, underchloric acid partly expires to hypochlorite ions: Cl2 + 2H2O -> HOCl + H3O + Cl- HOCl + H2O -> H3O+ + OCl- This falls apart to chlorine and oxygen atoms: OCl- -> Cl- + O Underchloric acid (HOCl, which is electrically neutral) and hypochlorite ions (OCl-, electrically negative) will form free chlorine when bound together. This results in disinfection. Both substances have very distinctive behaviour. Underchloric acid is more reactive and is a stronger disinfectant than hypochlorite. Underchloric acid is split into hydrochloric acid (HCl) and atomair oxygen (O). The oxygen atom is a powerful disinfectant. The disinfecting properties of chlorine in water are based on the oxidising power of the free oxygen atoms and on chlorine substitution reactions...... |
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| Author: | KudaPucat [ Jan 16th, '08, 17:55 ] |
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why "under"chloric? because of the oxygen? |
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| Author: | steve [ Jan 16th, '08, 17:57 ] |
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idunno! not like i did chem! |
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| Author: | KudaPucat [ Jan 16th, '08, 18:15 ] |
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oic... cool, you just sound so much more intelligent guessing about chem than I do... so I assumed. I haven't done Chem since year 10 or 11 can't remember (repressed memories) I always loved balancing equations though, no1 else could do it... but then I've always been a math nut :-) |
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| Author: | steve [ Jan 16th, '08, 18:21 ] |
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much is self taught................. tends to get complicated with ions in solution that form compounds that cant exist out of the water. H2O is really an AMAZING compound |
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| Author: | veggie boy [ Jan 16th, '08, 18:22 ] |
| Post subject: | |
You 2 should get a room 
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