Acid burns on the skin look like red, swollen and painful burns but they don't develop blisters in less severe acid burns.
More severe acid burns may have blisters and be deeper in the skin along with severe pain.
A strong acid or alkali can cause a full thickness third degree burn which damages the skin all the way through.
Blackened or dead skin is also common with some acid burns.
The strongest acid is fluoroantimonic acid which is a mixture of hydrogen fluoride and antimony pentafluoride.
Fluoroantimonic acid is called a super acid because of it's extreme acidity and is significantly stronger than other common types of acids.
Fluroantimonic acid is formed by combining antimony pentafluoride (SbF5) and hydrogen fluoride (HF).
Spectroscopic measurements also show that fluoroantimonic acid consists of a mixture of HF-solvated protons, [(HF) nH] + (such as H 3F+2), and SbF5-adducts of fluoride, [(SbF5)nF]â (such as Sb 4Fâ21).
Thus, the formula " [H 2F] +[SbF 6] â" is a convenient but oversimplified approximation of the true composition.
Despite its overwhelming strength, fluoroantimonic acid has an Achilles' heel.
It can't erode polytetrafluoroethylene (PTFE), commonly known as Teflon.
Thus, Teflon containers are the chosen vessels to store this potent liquid.
Hydrocyanic acid is the weakest acid with the $p{{K}_{a}}$ value of $9.2$ .
It partially ionises in water to give hydrogen ion and cyanide ions.
The cyanide ion is the strongest conjugate base. The hydrocyanic acid is then represented as $HCN$ .