Pharmacy Technician Certification Exam Practice Question
What is the final percentage strength of a drug if 500 mL of a 20% (v/v) solution is diluted to 1500 mL?
Correct Answer: C
Rationale: To determine the final percentage strength after dilution, use the formula for dilution: C1V1 = C2V2. Here, C1 is the initial concentration (20%), V1 is the initial volume (500 mL), and V2 is the final volume (1500 mL). Rearranging the formula gives C2 = (C1V1) / V2.
Calculating: C2 = (20% * 500 mL) / 1500 mL = 6.67%.
Option A (1.77%) is incorrect as it underestimates the dilution effect. Option B (3.23%) miscalculates the concentration after dilution. Option D (8.95%) also reflects an incorrect application of dilution principles. Thus, 6.67% accurately represents the final concentration after proper dilution.
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