Final answer:
To supply 50mg of a drug from a 70% solution that contains 35mg/mL, administer approximately 1.43mL of the solution.
Step-by-step explanation:
To calculate how much of a 70% drug solution needs to be administered to supply 50mg of the drug, we will use the information that the solution contains 35mg/mL. To administer 50mg, we need to determine how many milliliters contain this amount of the drug. Since the concentration is already given in mg/mL, the calculation is straightforward.
The formula is (Amount of Drug) / (Concentration) = Volume needed. Substituting the given values, it becomes 50mg / 35mg/mL = Volume needed. Therefore, the calculation yields approximately 1.43mL. Thus, 1.43mL of the 70% solution should be administered to provide 50mg of the drug.