ascorbic acid displays acidic properties only when it is dissolved in water

blue litmus turns red when dipped into solution b. solution a has no effect on litmus paper.

BRA - Blue turns Red in Acid.

Light bulb does not light up when Solution A is tested but lights up when Solution B is tested.

Monobasic Acid: HNO3 → H+ (aq) + NO3- (aq)

Dibasic Acid: H2SO4 (aq) → 3H+ (aq) + PO43- (aq)

formula unit for ionic compounds, molecule for covalent compounds