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Heparin, a blood thinner, was purchased by a hospital as a concentrate (10,000 units/ml). The medication...

Heparin, a blood thinner, was purchased by a hospital as a concentrate (10,000 units/ml). The medication must be diluted before it is given to the patient. How many ml of concentrate must be diluted to produce 0.5 L of 4,000 unit/ml solution?

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