You have 67.0mL of a 0.400M stock solution that must be diluted to 0.100M. Assuming the volumes are additive, how much water should you add?

Please guide me step by step, I'm very confused

Fern2015-11-30T17:07:12Z

0.400 moles/liter x 67 mL x 1 liter/1000 mL = 0.0268 moles

0.0268 moles x 1liter/0.100 moles = 0.268 liters

Final volume is 0.268 liters.
0.268 liters x 1000 mL/1liter = 268 mL

Volume of water = 268.0 – 67.0 = 201 mL

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