Problem: 63.0 mL of a 1.30 M solution is diluted to a total volume of 268 mL. A 134 mL portion of that solution is diluted by adding 117 mL of water. What is the final concentration? Assume the volumes are additive. 

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63.0 mL of a 1.30 M solution is diluted to a total volume of 268 mL. A 134 mL portion of that solution is diluted by adding 117 mL of water. What is the final concentration? Assume the volumes are additive.