With a pKa, of 1.2, squaric acid is unusually acidic for a compound containing only C, H,...

With a pKa, of 1.2, squaric acid is unusually acidic for a compound containing only C, H, and O.

Write a Lewis dot structure for the conjugate base of squaric acid and, using curved arrows, show how the negative charge is shared by two oxygens.