SOLUTION: What quantity of pure acid must be added to 400 mL of a 50% acid solution to produce a 60% acid solution?

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Question 899728: What quantity of pure acid must be added to 400 mL of a 50% acid solution to produce a 60% acid solution?
Answer by josgarithmetic(39616) About Me  (Show Source):
You can put this solution on YOUR website!
Being unknown acid identity, this will work for mass per volume, or for volume per volume percentage concentration:

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