SOLUTION: I want to dilute 88% ortho phosphoric acid to 85%. What should I do ?

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Question 1043875: I want to dilute 88% ortho phosphoric acid to 85%. What should I do ?
Answer by Alan3354(69443) About Me  (Show Source):
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I want to dilute 88% ortho phosphoric acid to 85%. What should I do ?
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Add water.
For P liters (or any volume unit) add W liters of water.
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88P + 0W = 85*(P + W)
88P = 85P + 85W
W = (3/85)*P
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Add 3 units of water for each 85 units of acid.