Boric acid
i really am not sure, but i'll just throw a wild guess out there. Lemon? it is a juice that is always an acid, and has 5 letters.
It is composed of about 5% acetic acid --> CH3COOH
The missing letters are G, L, H. Together, they spell out "GLUCURONIC ACID."
Hydrochloric acid is a type of acid that can eat through metal.
hydrocyanic acid
a type of wheat (with 5 letters:) is Durum!
i really am not sure, but i'll just throw a wild guess out there. Lemon? it is a juice that is always an acid, and has 5 letters.
it is 5% acetic acid (ethanoic by IUPAC). this is a weak acid
fungi
How about "whole" milk?
Feral
viper
Pixie
boxer, hound, corgi,
Cedar.
niece, uncle
rings