Question

why bitter gourd tastes bitter and what acid or base does it have?.......​

Answer 1

It is due to the presence of an alkaloid Momordicin which gives it a bitter taste

Answer 2

Bases turn red litmus paper blue. 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.