How many milliliters of a 95% (V/V) alcohol should be used to prepare 500 mL of a 75% (V/V) solution?
364
374
394
399
394
Rationale: 374 mL of a 95% (V/V) alcohol should be used to prepare 500 mL of a 75% (V/V) solution. This is a dilution problem with concentrations expressed in percentages. Initial strength (IS) = 95%. Initial volume (IV) is unknown. Final strength (FS) = 75%. Final volume (FV) is 500 mL. Therefore, (95%) x (IV) = (75%) x (500 mL).
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