A pharmacy technician has received an order for 0.5 L of 40% ethanol. On hand, the pharmacy has pure ethanol and 70% ethanol. She tries to use the alligation method to determine how much of each of these concentrations to use to achieve a 40% solution, but the calculations do not work because neither of the concentrations on hand is less than 40%. He decides to use the 70% ethanol for the higher concentration. What should he use for the lower concentration to achieve the 40% concentration?

Question

Quizplus · Accepted Answer

When all of the available stock solutions are more concentrated than the needed concentration, water is used to dilute the more concentrated solution.

A Pharmacy Technician Has Received an Order for 0