To make a relatively large quantity of perbromate, several hundred milligrams of XeF2 was stirred with 4 ml of 0.4 M NaBrOs until the XeF2 had all
reacted.
The resulting solution was 0.07 M in perbromate. Bromate was removed from this solution by precipitation with excess AgF at 0 C. Then the ice-cold
supernatant solution was made 0.5 M in RbF, and the rubidium perbromate precipitate was isolated, washed with a little ice water, and dissolved to
make 5 ml of solution.
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