SOLUTION: How many ounces of water must be added to 16 ounces of a 25% nitric acid solution to make a 10% solution?

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Question 791501: How many ounces of water must be added to 16 ounces of a 25% nitric acid solution to make a 10% solution?
Answer by josgarithmetic(39630) About Me  (Show Source):
You can put this solution on YOUR website!
16 ounces = 1 pound = 454 grams, assuming to make the correspondence between pounds and grams for MASS.

16%2A25%2F%2816%2Bw%29=10
Where w = the mass of water in ounces to add. Solve for w.