I have a science experiment, and I need to use an acid based liquid "slightly stronger than vinegar" (5%).

Question

I am supposed to use something strong enough to soften maccaroni shells, nuts etc., and even somewhat dissolve them if they are left in long enough. Any ideas of an easy to get liquid which is a little more acidic than basic 5% vinegar? Thanks!!!

Answer 1

pickling vinegar is about 10% acetic acid
lemon juice is pretty acidic (pH about 2.2)
both at the grocery store

(but you might have better luck reacting those items with a base rather than an acid)
(chlorine bleach is an easy to get, though rather strong, base -
dilute it if you use it)