That would be exciting ....
Not so much dangerous as inconvenient and requiring a lot more care. I imagine it wouldn't be that hard to dispose of if you could neutralize it, but I don't know how much base that would take or how much mess it might make. A few cases of baking soda and....
My favorite mnemonic device is no longer politically correct but no one has come up with a better one. "Bad Boys Rape Our Young Girls But Violet Gives Willingly." It gives the color code for resisters and capacitors: black = 0, brown = 1, red, orange, yellow, green, blue, violet, gray, white = 9. Learned in an all male engineering class.
Certainly do use it!
You don't want to have to dispose of a gallon of glacial acetic acid. You may have to pass what you have left on to others when you pass on...A gallon will last practically forever!
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Doremus
My understanding is citric acid is a stronger acid than acetic. Depending on concentration and other ingredients a citric acid stop bath will have a lower pH than an acetic acid stop. This may or may not be relevant depending on the process.
If you slowly add an alkali (e.g. lye) to Acetic Acid, you will start with a very low pH which very quickly goes up to around 4, then slowly moves up to about 5 (and it takes a fair amount of alkali to get there), then after about pH 5.5 additional alkali will raise pH quickly again. With Citric Acid you will see three such steps, and the first step is too low for us (somewhere between pH 3 and 4), the second one would be sort of alright, and the third step is already in the pH 5.5 - 6 region where some development agents already become active. So as far as buffering is concerned, we use one of the three protons of Citric Acid (or two of the three in dilute Citric Acid).Rudeofus - interesting info thanks for this. Can you elaborate on acetic acid buffering between pH 4-5? I'm not sure I follow.
A indicator tells you whether pH has gotten above a certain level and should work regardless of which acid you use (assuming reasonable choices).So the bottom line is that citric acid stops don't last as long? That's ok with me - still cheap. I use the indicator ones - is the indicator still an effective, well, indication?
My biggest qualm with mold is that it reeks. If we use Citric Acid, with all its disadvantages, because it is "odorless", then moldy Citric Acid stop bath is completely pointless IMHO.I have noticed glop, presumably fungus, growing in old bottles of citric acid stop which I've had to throw out though, even concentrate that was pretty old.
This is one of my oldest stories. Near the end of High School, many years ago, I thought the gallon container of glacial acetic acid in the science lab was getting lonely. It was nearly full and the bottle was made of very thick glass with a large cap. I brought it home on the subway (NY). It just sat on the floor between my legs for the whole trip. It was late enough in the year that the trains were no longer putting out any heat. A gallon of glacial acetic acid can last for years but not forever. If someone tried this today on a subway he'd get locked up for a good long time.
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