SOLUTION: How many milliliters of water must be added to 60 mL of a 15% iodine solution in order to dilute it to a 10% iodine solution?

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Question 703111: How many milliliters of water must be added to 60 mL of a 15% iodine solution in order to dilute it to a 10% iodine solution?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +w+ = ml of water to be added
+.15%2A60+=+9+ ml of iodine in 15% solution
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+9+%2F+%28+w+%2B+60+%29+=+.1+
+9+=+.1%2A%28+w+%2B+60+%29+
+9+=+.1w+%2B+6+
+.1w+=+3+
+w+=+30+
30 ml of water must be added