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Question

The following diagram represents four different solutions that may contain any of these four species in varying concentrations: H₂A, KHA, and K₂A.

Diagram showing four solutions labeled A, B, C, D with species H2A, HA-, A2- for buffer identification.

K⁺ ions are not shown for clarity. Identify which of these solutions is a buffer.

Accepted Answer

Close-up of solution B with H2A, HA-, and A2- species for buffer identification.

Answer

Close-up of solution C showing H2A and HA- species for buffer identification.

Answer

Close-up of solution D showing only H2A species for buffer identification.