When 100 mL of a 25% (W/V) solution is diluted to 1 liter, what will be the percentage strength (W/V)?
2.5
2.75
3.5
5.5
2.5
Rationale: The percentage strength will be 2.5 . Remember that 2 liters = 1000 mL, and this is a dilution problem. The IS = 25%, the IV = 100 mL, the FS is unknown, and the FV = 1000 mL. Therefore, 25% = 100 mL = (FS)(1000 mL). So, the FV is 2.5.
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