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If volumes are additive and 316 mL of 0.11 M potassium bromide is mixed with 406 mL of a potassium dichromate solution to give a

If volumes are additive and 316 mL of 0.11 M potassium bromide is mixed with 406 mL of a potassium dichromate solution to give a new solution in which [K+] is 0.832 M, what is the concentration of the potassium dichromate used to make the new solution?

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