The proposed reaction mechanism is as follows:
A. BrO₃⁻(aq)+H⁺(aq)->HBrO₃(aq)
B. HBrO₃(aq)+H⁺(aq)->H₂BrO₃⁺(aq)
C. H₂BrO₃⁺(aq)+Br(aq)->B₂O₂(aq)+H