The active ingredient of Pepto-Bismol is the compound bismuth subsalicylate, which undergoes the following dissociation when added to water:
C₇H₅​BiO₄​(s)+H₂​O(l)⇌C₇​H₄​O₃₂⁻​(aq)+Bi₃+(aq)+OH⁻(aq)K=?
If the maximum amount of bismuth subsalicylate that reacts by this reaction is 3.2×10⁻¹⁹ mol/L, calculate the equilibrium constant for the preceding reaction.