Determine from the following pictures which represents a solution of a weak diprotic acid, H₂A, and which represent/s unlikely scenarios. Note that the water molecules were omitted for clarity.

• A. Picture (a) illustrates a weak diprotic acid, while pictures (b), (c), and (d) are unlikely scenarios.
• B. Pictures (b), (c), and (d) illustrate a weak diprotic acid, while picture (a) is unlikely.
• C. All four pictures illustrate a weak diprotic acid.
• D. All four pictures are unlikely scenarios.

Answer: (A)