Carbonic acid (H2CO3) is generally considered the weaker acid compared to picric acid (C6H3N3O7).
The strength of an acid is determined by its ability to donate protons (H⁺ ions) in solution. Picric acid is a much stronger acid due to its highly electronegative nitro groups, which stabilize the negative charge on the conjugate base after proton donation, making it more likely to lose a proton.
