Just from looking at the periodic table, is it possible to classify weak acids and/or bases?

Question

anonymous · Answer

i do not believe so, you can memorize them :

STRONG ACIDS (if it helps they are mostly halogens exept for F which is not considered a strong acid.)
hydrochloric acid	HCl
hydrobromic acid	HBr
hydroiodic acid	HI
sulfuric acid	H2SO4
nitric acid	HNO3
perchloric acid	HClO4

STRONG BASES 
LiOH - lithium hydroxide
NaOH - sodium hydroxide
KOH - potassium hydroxide
RbOH - rubidium hydroxide
CsOH - cesium hydroxide
*Ca(OH)2 - calcium hydroxide
*Sr(OH)2 - strontium hydroxide
*Ba(OH)2 - barium hydroxide
* These bases completely dissociate in solutions of 0.01 M or less. The other bases make solutions of 1.0 M and are 100% dissociated at that concentration. There are other strong bases than those listed, but they are not often encountered.

anonymous · Answer

ust adding onto what purity11 stated, if it is not a Strong Acid or Strong Base then it is a Weak Acid or Weak Base. Thus if you memorize the Strong ones, all others are weak... I know I know we all hate memorization, just takes practice though =-)