Pharmacy Technician Certification Board Practice Exam Practice Question

Correct Answer: B

Rationale: To determine the percentage strength of the final volume after dilution, it's essential to understand the concept of dilution. Initially, 250 mL of a 10% solution contains 25 g of methyl salicylate (10% of 250 mL). When this is diluted to 1000 mL, the total amount of methyl salicylate remains the same, but the volume increases.

Calculating the new percentage strength involves dividing the amount of solute (25 g) by the new total volume (1000 mL), resulting in a concentration of 2.5%.

Option A (0.25%) underestimates the concentration, while C (10%) reflects the initial concentration, not the diluted one. Option D (25%) overestimates the concentration. Thus, the final percentage strength is accurately represented by option B (2.50%).