I doubt that it matters. Sulphuric acid is an oxidizing acid that can do damage through either pH or oxidization while HCl can only ph. Also I think that sulphuric is a more typical acid to ancient alchemists. Furthermore, H2SO4 is a nonvolatile liquid and Harry only produced a small amount of it.
Of course if you are Badass Adult Harry, you just transfigure a spot of Chlorine Trifluoride in the troll and watch it explode.
chlorine trifluoride
See this and just about everything else in that blog's "things I won't work with" category, which is hilarious (though there are a few links you might not want to follow if easily upset, notably the one about dimethyl mercury).
This is a new thread to discuss Eliezer Yudkowsky’s Harry Potter and the Methods of Rationality and anything related to it. This thread is intended for discussing chapter 88-89. The previous thread has passed 500 comments.
There is now a site dedicated to the story at hpmor.com, which is now the place to go to find the authors notes and all sorts of other goodies. AdeleneDawner has kept an archive of Author’s Notes. (This goes up to the notes for chapter 76, and is now not updating. The authors notes from chapter 77 onwards are on hpmor.com.)
The first 5 discussion threads are on the main page under the harry_potter tag. Threads 6 and on (including this one) are in the discussion section using its separate tag system. Also: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18.
Spoiler Warning: this thread is full of spoilers. With few exceptions, spoilers for MOR and canon are fair game to post, without warning or rot13. More specifically: