hydronium (H₃O⁺)
-1.7
hydroxide
15.7
water
14
hydroiodic acid
-10
hydrobromic acid
-9
hydrochloric acid
-6
sulfuric acid
-3
sulfonic acids
-1
hydrofluoric acid
3.2
carboxylic acids
4
protonated amines
9-11 (contains a nitrogen atom which has gained a positive charge by accepting a hydrogen ion)
thioles
13 (containing the group —SH)
malonates
13 (a dicarboxylic acid)
alcohol
17
ketone/ aldehyde
20
nitrile
25
ester
25
alkyne
25
sulfoxide
31
amine
35ish
hydrogen
36
alkene
43ish
alkane
50ish