Question

which element is common in acid and base

Answer 1

All acids contain hydrogen, but not allhydrogen-containing compounds are acids. Most acids also contain oxygen.

Answer 2

- contrasting properties of acids and bases[edit] ... Acids give off H+ (Hydrogen) ions in water; bases give off OH- (Hydroxide) ions in water. Acids generally taste sour due to the sour H+ ion; bases taste bitter due to the OH- ion; but they may have other tastes depending on the other part of the molecule.

- All acids contain hydrogen, but not all hydrogen-containing compounds are acids. Most acids also contain oxygen.