Certification of Pharmacy Technicians (ExCPT) Practice Exam

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How many grams of sucrose are needed to prepare a 20% solution in 4 ounces?

The correct answer is: 24

To prepare a 20% sucrose solution, the percentage indicates that there are 20 grams of sucrose for every 100 milliliters of solution. First, we need to convert ounces to milliliters since the percentage is typically based on volume measurements in milliliters. There are approximately 30 milliliters in 1 ounce. Therefore, 4 ounces is equivalent to 120 milliliters (4 ounces x 30 mL/ounce). Next, to find out how many grams of sucrose are needed for 120 milliliters at a 20% concentration, you can set up the calculation as follows: 20% means 20 grams of sucrose per 100 mL. To find the amount needed for 120 mL, you can use a proportion: (20 grams / 100 mL) = (x grams / 120 mL) Cross-multiplying gives: 100x = 2400 Solving for x results in: x = 2400 / 100 = 24 grams. Thus, to prepare a 20% sucrose solution in 4 ounces (120 mL), 24 grams of sucrose are required. This confirms that the correct response