5.0 M PQ-7. What is the concentration of the bromide ion if 25.0 mL of a 0.50 M AlBr3 solution combines with 40.0 mL of a 0.35 M NaBr solution? Assume volumes are additive. (A) 7.9x10 molL- (B) 0.41 mol-L-1 (C) 0.79 mol-L-1 RO 8 IT (D) 2.1 mol L-1