Comment Re:What they do there (Score 1) 252
HF is a "weak acid" because the flourine is so electron-loving that it doesn't want to let go of the e- from the hydrogen, even when in water. Most acids dissociate in water quite freely, it's why they're able to react in the first place.
HF is extremely nasty stuff, because flourine is such incredibly nasty stuff. That's a "weak acid" by convention, but it's not really anything you want a decently concentrated solution of left unchecked.