A 3.650-g sample containing bromate and bromide was dissolved in sufficient water to give 250.0 mL. After acidification, si ver nitrate was introduced to a 25.00-mL aliquot to precipitate AgBr, which was filtered, washed, and then redissolved in an ammoniacal solution of potassium tetracyanonickelate(II):
Ni(CN)42- +2 AgBr(s) → 2Ag(CN)2- + Ni2+ 12Br-
The liberated nickel ion required 26.73 mL of 0.02089 M EDTA. The bromate in a 10.00-mL aliquot was reduced to bromide with arsenic(III) prior to the addition of silver nitrate. The same procedure was followed, and the released nickel ion was titrated with 21.94 mL of the EDTA solution. Calculate the percentages of NaBr and NaBrC3 in the sample.
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