1 bucket of Hydrogen + 1 bucket of Fluorine/Chlorine or whatever you want to make an acid with yields 1 bucket of acid. But to electrolyze HF or HCl, it takes 2 buckets and you get 1 bucket of each.

almost all of the chemistry recipes have this issue. it would require a massive rewrite to fix, and is outside of the scope of the pack. you can try asking arch to fix it in GTCE if you want