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A 90.0 mL sample of 0.640 M NaBr is mixed with 220 mL of a SrBr2 solution. If the final solution has a bromide ion concentration of 1.26 M, what was the concentration of the SrBr2 solution? (the volumes are additive) I dont understand how to write the reaction, NaBr + SrBr2 ----> ?

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