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5. How many milliliters of a 518 mL solution of 2 M K3PO4 must be used to make 302 mL of a solution that has 0.89 moles of K+?

6. A 12 mL sample of a solution of AlBr3 was diluted with water to 42 mL. A 30 mL sample of the dilute solution was found to contain 2.26 M Br-. What was the concentration of AlBr3 in the original undiluted solution?

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