Quite so. In fact, I'm studying Medicine and had to take Biology and Chemistry exams.
However, you are overrating the abilities of acid to no ends.
Do you know how in Breaking Bad they use acid to -MELT- human bodies? That's bullcrap. Look at Mythbusters on youtube and you'll see that acid doesn't melt skin, it simply eats at it. They put humanlike tissue in concentraded hydrofluoric acid and after 24 days it was still there ( wounded, sure, but it wasn't melt ).
And the dogs can obviously go back if they feel the acid. What I meant by saying that it's usable in closed areas is that since it's a mist, you can simply go away from it. In a closed area you obviously can't go through the wall and run away.
Mei sealed the room for the acid to be usable.
Let me explain how using it in a closed space works.
Mei sealed the room, so there was no gas coming in or out. That means that if she used the acid, there would be no gas interferences with the atmosphere -IN THAT CLOSED ROOM-. So she could control the ph perfectly.
But in a wide open area? You'll have a very unstable air composition. Furthermore, Kakashi's suiton fired at her acid mist will dramatically reduce the acid concentration and it's obvious that the acid release jutsu takes more chakra than Kakashi's suitons do, so that's not a valid option for Mei.
Acid can also be countered by Kakashi going underground.
Mei doesn't have Ay or Onoki's speed or melee potential. If she goes in CQC she gets raped.
Acid melts skin quite quickly.
It's bone and the underlying that takes time - up to days - to melt. From the moment the dogs touch the acid, their skin would start to corrode. By the point the become aware and leave, they're have been hit by acid (of at least pH 1) for no less than 2 seconds. The dogs would have severe open wounds and would be bleeding profusely. I never claimed that acid would melt them in an instant, so I don't know where you get i'm overrating it from. The simple truth is that those dogs would bleed out and die within a matter of minutes from touching that acid. Even if they leave in time, they'd die relatively soon after since there's no medic around to heal those head to toe wounds.
In other words, the dogs are dying from blood loss, not melting; A human body can only survive on half the total amount of blood, i'm sure a dog's body doesn't differ too far from this.
@2nd bold: Incorrect. Mei closed the room become her acid does not discriminate between friend and foe. There were many allies in the surrounding zone, with only 2 foes. If she were to leave the room opened, she'd injure every single person around. As we can see
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, mei had to manually neutralize the pH so that it would cause no harm to her allies
who were out in the open(take note that there was a hole in the wall leading to outside). Therefore, she does not require an enclosed environment to maintain the pH. She's capable of doing it where ever she pleases as she does indeed control the pH, hence simple environmental factors aren't enough to ruin her control.
Kakashi going underground is a valid argument. I'm glad we're not wasting time on this Kamui GG nonsense anymore. However, once underground, kakashi can only maneuver away from mei. If he moves towards her to use the head hunter jutsu, she spits acid or lava on him and he dies. If he moves in for a raikiri, he'd be in excrutiating pain to the point where he'd not be able to even do the jutsu; due to corrosion. Let's not forget that, unlike those mythbuster gelatin dolls, humans have nerves. Kakashi would not only have to kill mei before he bleeds out, but he'd also have to continue his assault without flinching one bit under the pain . In a sense, it would be like trying to stab someone while boiling water is being poured onto you.
As to your final line, onoki has no melee potential. The hell? Mei's in fact shown better melee potential than Onoki along with the fact that she could surround herself in acid while engaging in CQC, but anyway that's not the point. The point is that, due to hidden mist, Kakashi's reaction time is hindered along with his sharingan pre-cog and kamui GG. Due to boil release, he can't get close to melee her which means raikiri, head hunter, and even his hunter nin dogs are effectively useless. This leaves kakashi with his only viable mid-long range techs which are suiton moves. Unless there's already a water source nearby(kakashi's never done it without one), kakashi's not using suiton whereas mei can blast him with lava, suiton, etc while his reactions are being hindered. Yes, Mei's boil release and other jutsu take chakra, but this fight won't last long enough for that to become a factor.
Hindered reflexes + Impossibility to do CQC means kakashi loses.
Side note: Good luck with medicine. How many years do you have left? Everyone always told me to take medicine, but I hate blood too much for that, though I do miss doing science. Left it behind for computer science. :T_T:
EDIT: I can kinda see where you may have thought i meant melt the dogs into a puddle from my response to your 'melt on touch'. But i meant melt/corrode skin which is why I spoke about dripping acid on your skin/hemorrhaging.
