can I store NaOH waste in a platic bottle for an extended amount of time?
202032
i would assume it depends on the plastic.  But NaOH pellets are stored in HPDE (high density polyethylene) plastic containers.  So my thinking is if concentrated NaOH is stored in plastic than the liquid should also be able.
578848
You're not going to easily deploymerize it. You may have a chance of dissolving it though. Look up its solubility parameter and choose a solvent with the same value of solubility parameter.
86533
No you can not. THe air particles would desolve it way faster. THere is no way to preserve it.
428836
I generally follow the recommendations provided by our safety officer at my academic lab.\n\nIf your liquid cultures can afford the extra volume, you can just add a lot of deionized h2o, that should stop the growing (by lysing the cells).  Then toss in the bio-hazard bag, for the autoclave.  \n\nOr, if you have access to an autoclave, then autoclave the culture, and you can probably dump down the drain.\n\nCheck with your safety officer!!\n\nIt was fun thinking about your question.  Pass on the good Karma!
531241
The thing is, spray bottles aren't airtight. If they were, you wouldn't be able to spray anything with them. And it is the air that reduces the power of the bleach. Straight bleach that has not been diluted and is kept in a closed container does deteriorate slightly over time, but retains most of its potency, as long as the container remains closed. The reason for that is that when some of the bleach molecules combine with the air molecules, they use up all the available 'hooks' that allow them to link together. So the rest of the bleach is unaffected and only the surface layer (one molecule thick) will be weakened. \nDoes that make sense?
138793
Since no has taken a stab at this yet, I'll try:\n\n  As an experiment, food was first cooked (to kill germs)\nand then stored in air-tight bottles. It was taken aboard an \nEnglish ship. After a couple of months the bottle was opened\nand the food was found not to have spoiled.\n  A sheet metal worker found out about this, and thought \nabout storing food in cans instead. James Burke discusses \nthis in one of the Connections Programs. I've included a \nlink in the sources part.\n  There is no reason the surface area of the can would vary\nbetween now and then unless the cans were first made with \na square bottom. I don't believe it was.
81951
It´s possible, first step is settle the water. Then water pass to biological treatment to low DQO. You could sell the oil to refinery and they cracking the mix again to break the chains into other materials.
451404
It depends on your definition of "danger", "residue", and "use".  If the use was acid neutralization, the only danger would be the salt formed and its impact on rusting metal.  If the NaOH was not "used up", it will stay basic for years, the pH indicating the level of "danger".  The residues could be caustic, salt, or a salt from how it was used.  You have to test to see what it is or know the "use".
126252
add 2 parts HCl 1 part H20 to dilute properly
495438
no just clean it & keep it  dry.\n\n~vadge~
219187
Not a pro at taking that stuff any more, but I found shaking it in a bottle and drinking it quickly was the best way.  It didn't seem to matter what quantity I used: the powder would settle at the bottom.
352520
Pack it in salt to "cure" it first or it'll start to rot.
103861
You can use them for neutralizing waste before discarding, but for analytical work they should be replaced.  Shelf lifes vary but one year should be a good max for prepared reagents and five years for solids and concentrates.  This of course varies based on the particular chemical and usage.    Of course, if there is any question, discard.
180128
If it's in a sterile container, it should keep for a while. I wouldn't want to be using the same fridge though.
46226
rubbing alcohol will desolve most adheisives
134512
The obvious answer "by destillation" is technically challenging. I know of a Danish firm EnvoTech ApS that built systems which concentrate problematic waste water by cyclical destillation with very little energy loss,  which would help concentrate the remaining acid, but only up to a degree where the stainless steel the system is built from begins to corrode, and without removing the discoloration. You'd get quite good water condensate to reuse in the process, which isn't that helpful for your problem...\n\nThe foamy particles might be removable by letting the water go through a flotation trough. The resulting acid will still be weak and brown, though.
481584
I sure hope this is just a paper exercise and is not going to be actually performed.  Sodium hydride will react very exothermically with water and is extremely hazardous.