Ok..i found my notes on Stong/Weak acid or base
Common Stong acids:
hydrocholoric acid
sulfuric acid
nitric acid
Weak acids (decreasing order of acid strength) :
oxalic acid
hydrogensulfate ion
phosphoric acid
hydrofluoric acid
ethanoic acid
carbonic acid
hydrogen sulfide
dihydrogenphosphate...
Strong acids are:
HCl, H2SO4, HNO3
Any acids other than those are Weak acid
H3PO4 is said to be triprotic although it is Weak acid
Indicator:
Stong acid + Stong base <---Use bromothymol blue
Stong acid + Weak base <---Use methyl orange
Weak acid + Stong base <---Use phenolphthalein