Question

what are the tricks to identify acid , base

Answer 1

Acid give H+ ion and base give OH- ion
Ex-Hcl is acid
Ex-NaOH is a base

Answer 2

1) acids dissociate in H+ ions in aqueous solution while bases dissociate in OH- ions
2) through universal indicator, acids have pH lower than 7 while bases have pH higher than 7
3) acids turn blue litmus red and bases turn red litmus blue
4) By bronsted lowry theory
An acid can donate a proton to another substance while a base can accept a proton
5)By Lewis concept
An acid is a substance which can accept a pair of electrons while bases can donate a pair of electrons