[branja]

If you fell into 100C hot and extremely acidic water it would be a big problem – Barbara Cavalazzi, University of Bologna

[Mtinie]

Semi-serious question: In the unfortunate circumstance that you find yourself immersed in 100C water with a PH of 0, which condition would be the one that has the higher likelihood that it would kill you first?

[jaggederest]

It depends on which ion(s) in particular was in the solution.

If it was something relatively pleasant, like the referenced sulfuric, carbonic, and chloric acids, the heat would almost certainly be more of a problem in the short term. In the long term you'd be missing significant portions of your anatomy due to the dehydration of your skin by the sulfuric acid, but that could certainly wait.

On the other hand, if it were (for example) hydrofluoric acid, you'd have nerve transmission issues and your heart would stop well before you'd be cooked thoroughly.

Here's an interesting video by Nile Red showing that it's not the acid, per se, that is especially dangerous: https://www.youtube.com/watch?v=XeVZQoJ5FdE

Now, when you heat things, all the reactions speed up. So it'd certainly be only a few seconds before things would get very drastic.

[mirimir]

And with hot fuming nitric acid, you'd go up in flames.

[scythe]

A man fell into the boiling lake on Dominica and was cooked to death in seconds so I'm going with that. But acid is made stronger by heat so it's not necessarily separable.

[taneq]

The temperature. It takes far less long to boil alive than to dissolve.

[arkitaip]

I would want to kill myself over not knowing if my underwear were clean should I survive and had to be medically treated.

[danvayn]

Food for thought.