Anita, you are funny, you remind me of my husband. With your scientific explanations... its all good.
My dad's a retired chemist, and I originally wanted to be a veterinarian, so I come by it naturally.
I should add that my dad probably now knows more about soapmaking than he ever expected to, due to my questions.
My husband says Pyrex would be a better choice than pickle jars. (but plastic is better still)
Actually, Pyrex is iffy as well. It evidently has the same response over time that glass does to a lye solution (etching into the glass). I think it will take longer with Pyrex, but I wouldn't want to sit around waiting for it.
I've got a small pyrex-type measuring cup that I weigh out my Fo/Eos into. (Learning the hard way not to use plastic for that stuff as I watched the plastic soften!) I have a largish-plastic pitcher that is my standard lye mixer-upper-in container. I've recently bought some plastic measuring cups to freeze goatsmilk/beer/a combination of the two in. I mix my lye into whatever frozen stuff is in there, and I don't want to have to worry about busted Pyrex at a really bad moment.
Also, I have seen it somewhere else on this forum about not using vinegar on your skin, but the thing is, it worked VERY FAST at making the sting go away. And I don't have a burn scar, so I'm still not convinced. But, I did the water flush too, just to be safe. Do you know of anything that says that vinegar would HURT you?
I tracked down that post I was referring to about rinsing with water versus vinegar, and she made the obvious point that water will dilute the lye solution very quickly, and is usually easy to get to. She also suggested, after the water rinse, to use a very dilute vinegar/water solution, a 1/5 ratio.
As far as the hurt question, I had to call my dad.
He said that if you put an acid (the vinegar, in this case) with a base (the lye solution), you can generate heat. Obviously the stronger these solutions are, the more powerful the reaction would be. Vinegar is about a 5% solution. The concern for me would be if you had a stronger than usual lye solution. Say you were making GM soap, and your method was to split the liquid requirement 50/50 between water and GM, mixing your lye with the water and adding the GM a bit later in the process. If you're just using half the usual water amount to mix your lye, it will be twice as strong a solution as usual. I'm thinking if you splashed some of that on you, and then went straight to the vinegar, you could end up with an even worse burn than starting with the water.
Hope you've managed to stay awake for this.
I also agree with soap1967 about the fumes. (I evidently just skipped over the part where you had a lid on the jar.)
I'd be VERY
hesitant to put a solid lid on a freshly-made lye solution. Even if you use a plastic container, if your lye solution takes up most of the space in the container, and that container is sealed, the pressure has to go somewhere. Since plastic won't break like glass would, the pressure could blow the lid off, and spray lye solution all over the place.