Most acetic acid that you by is 28% acetic acid solution. You dilute it to make stop bath. The glacial acetic acid is much more concentrated (so be more careful not to gat any on your hands). Therefore, you need smaller quantities to dilute it to a stop bath. The following is from the Freestyle website:
Mixing Stop Bath From Glacial Acetic Acid
You can make a working solution of stop bath from glacial (100%) acetic acid in two steps. First, dilute the full-strength acetic acid down to 28 %. To do this, mix 3 parts of glacial acetic acid with 8 parts of water.
For example, 3 oz. acetic acid + 8 oz. water, or 6 oz. acetic acid + 16 oz. water. Always pour the acetic acid into the water to avoid splashing.You can store the 28% acetic acid solution for later use.
Next, to make working solution: Measure our 48 ml (milliliters) of your acetic acid solution, and then add to 1 liter water.
It freezes at 17C which can cause the bottle to rupture.
Don't forget " Do what you ought ter (to), add the acid to the water"
We had a saying in High School Chemistry classes, "Unless your **** is limp and flacid, add the water to the acid"
(yes, it was an all-boys school)
Ordinary kitchen cooking or salad dressing vinegar is basically just contaminated acetic acid, so whether it's hazardous or not is a matter of
concentration. I prefer to buy glacial acetic acid for economy then dilute it down, always under a fume hood, well protected. But it takes very little to make an effective stop bath. Even 1/2% seems to work fine. ... One time my wife and I were taking a flight in a typical three-seat section, and the lady next to us was a Coca Cola executive. So my wife asked me if she got her Cola for free. She replied that she would never personally drink it, because every ingredient they use is shipped DOT Hazardous. Yeah, Cola will eventually rot your teeth out. But the concentrated carbonic acid they start with would burn right through you. So it's all relative. If you're doubtful about handling the real deal, buy your acetic acid prediluted to 28%, which is how photo stores usually sell it anyway.
That's what we were taught in high school electronics class.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.
phosphoric acid...
That's what we were taught in high school electronics class.
I echo the "why on earth use the stuff?" questions.
Well I understand when it's necessary. I keep saying I'm going to do wet plate one day, and that has its risks to be managed. But sheesh, KISB is dirt cheap already and a bottle lasts forever.
Big Boys RACE Our Young Girls But Violet Generally Wins. = first version I learned, much more acceptable.
I got a gallon for free. Why waste the stuff?
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!
And, with reasonable caution and proper storage, it is not so terribly dangerous to work with.
Best,
Doremus
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