The visible "cloud" is water vapour, as the water is heated and aerosolised by the bubbling hydrogen. But it's the hydrogen that's potentially dangerous - it's not toxic, but flammable if exposed to an ignition source.
Note that for copper versus acid, it doesn't really need to be a strong acid to produce this reaction (and create the acid-eaten coin seen here). Vinegar, lemon juice or coca-cola will all do much the same thing - it just takes slightly longer time.
Yes, both the cupronickel alloy and the pure copper will react with the acid - but the copper reacts faster, creating the acid-eaten-core effect.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis
Quote: Note that for copper versus acid, it doesn't really need to be a strong acid to produce this reaction (and create the acid-eaten coin seen here). Vinegar, lemon juice or coca-cola will all do much the same thing - it just takes slightly longer time.
Exactly what I've been telling Silviosi and he keeps referencing studies that he says prove me wrong. I don't even bother to read them because I know either they are wrong or he's interpreting them wrong. I too have pulled these copper-eaten coins out of car cupholders. This is coin collecting 101 for even fairly novice collectors.
Yeah, sorry I didn't think of that, but I think I've proven my point. To be honest, I think the unsubmerged part wouldn't get off completely unscathed in a sealed jar.
I read all those posts. The hydrochloric acid it is what can solute the cooper and other metals. This is know from more then 400 years. So sorry nothing new, except you show BOBBY only the cooper and not the Ni. this acid attack the both.
Your opinion I do not interpreted well the studies, but we apply all the times and give results.
Mild Acids are those who cause the most damage to the non ferrous metals, if the conditions will be reach.
@ NumismaticsFTW I do not retired, just be busy and far from my office, if someone want to know.
Bobby your experiment was with a strong acid and the only one strong who can react strong with the cooper as you do. Mild acids will not solute the cooper over the time but could have some physical impacts and changes. If I understand well you want to contradict hundreds of years of chemistry and materials proprieties and proved was wrong. Go ahead because this will be Nobel Price for you.
@ SAP: hydrochloric acid it is HCl and to see what is happened in combination with cooper, look at this course video:
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If you involve temperature and you broke the ions then is other ball game. You say 2 HCl which for me how you wrote it is other thing. This is meaning Hydrogen chloride and it is complete other solute.
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Posted 09/18/2023 4:46 pm
Funny though, we KNEW it was going to happen.
