Sue from Elkhart, IN
Editor's Note: Bleach and vinegar should not be mixed, especially in quantity, because it creates a toxic gas that could be deadly. Feel free to respond with homemade cleaning recipes, but please do not mix bleach and vinegar (or bleach and ammonia).
Here are the recent answer to this question.
Vinegar increases killing power of bleach
Adding white vinegar to diluted household bleach greatly increases the disinfecting power of the solution, making it strong enough to kill even bacterial spores. Researchers from MicroChem Lab, Inc. in Euless, Texas, report their findings today at the 2006 ASM Biodefense Research Meeting.
Sodium hypochlorite (NaOCl) in the form of laundry bleach is available in most households. The concentrate is about 5.25 to 6 percent NaOCl, and the pH value is about 12. Sodium hypochlorite is stable for many months at this high alkaline pH value.
"Laundry bleach is commonly diluted about 10 to 25-fold with tap water to about 2000 to 5000 parts per million of free available chlorine for use as an environmental surface disinfectant, without regard to the pH value of the diluted bleach. However, the pH value is very important for the antimicrobial effectiveness of bleach," says Norman Miner, a researcher on the study.
At alkaline pH values of about 8.5 or higher, more than 90 percent of the bleach is in the form of the chlorite ion (OCl-), which is relatively ineffective antimicrobially. At acidic pH values of about 6.8 or lower, more than 80 percent of the bleach is in the form of hypochlorite (HOCl). HOCl is about 80 to 200 times more antimicrobial than OCl-.
"Bleach is a much more effective antimicrobial chemical at an acidic pH value than at the alkaline Ph value at which bleach is manufactured and stored. A small amount of household vinegar is sufficient to lower the pH of bleach to an acidic range," says Miner.
Miner and his colleagues compared the ability of alkaline (pH 11) and acidified (pH 6) bleach dilutions to disinfect surfaces contaminated with dried bacterial spores, considered the most resistant to disinfectants of all microbes. The alkaline dilution was practically ineffective, killing all of the spores on only 2.5 percent of the surfaces after 20 minutes. During the same time period the acidified solution killed all of the spores on all of the surfaces.
"Diluted bleach at an alkaline pH is a relatively poor disinfectant, but acidified diluted bleach will virtually kill anything in 10 to 20 minutes," says Miner. "In the event of an emergency involving Bacillus anthracis spores contaminating such environmental surfaces as counter tops, desk and table tops, and floors, for example, virtually every household has a sporicidal sterilant available in the form of diluted, acidified bleach."
Miner recommends first diluting one cup of household bleach in one gallon of water and then adding one cup of white vinegar.
By (Guest Post)02/13/2009
Bleach and ammonia are toxic - separate - and esp. mixed. I prefer not to use either.
By Tom N. (Guest Post)02/12/2009
Bleach is a base. Also, it is bases that have that slippery feeling.
For instance, bleach has a pH of 9-11. Anything over 7 is a base.
By (Guest Post)05/22/2008
Bleach is a base and vinegar is an acid, so when they mix it's normally always bad. Mixing and thing with a high base rating and low acidic rating can be deadly.
By Laura Perry (Guest Post)12/18/2006
I was wandering if it's not good to mix bleach & vinegar; is there any other product we shouldn't mix either? And how can I use alcohol and peroxide? Any recipe suggestions out there? And can I mix them? Thanks....Laura Perry Norfolk, VA
By Joyce 02/17/2006
I use vinegar to wash my floors because it makes them shine. But, I also use bleach once in a while to really clean them good( I have 6 dogs) I didn't know that bleach and vinegar didn't mix and I could not breath because I had not rinsed the vinegar out of my mop before using the bleach water. So be careful what you mix.
By Leann 01/29/2006
Bleach and ammonia are a disaster if you mix them. One time when I was a kid, I got the idea to clean the cement floor in the basement for my mom. She never said not to mix products, so I mixed ammonia and bleach in a bucket. Before you could say jackrabbit, it sparked and plummed a cloud of noxious gas. I almost choked to death, before I could run up the stairs. I coughed for days. I was extremely lucky to have lived.
By Linda (Guest Post)12/02/2005
I use an empty quart size bottle with a sprayer cap. I put in 1/4 cup white vinegar and then fill with water. That is it. I use this to clean counters, cabinets, appliances, floor, bathroom, everything. For the floor, after sweeping, I spray to solution on the floor, then mop with a damp mop. Very cheap way to clean.
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