Pharmacy Technician Certification Board (PTCB) Math 2025 – 400 Free Practice Questions to Pass the Exam

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To prepare 20 mL of a 10% solution, how many grams of solute are required?

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To determine how many grams of solute are needed to prepare a 10% solution, we start by understanding what a 10% solution means. A 10% solution indicates that there are 10 grams of solute for every 100 mL of solution.

To find out how much solute is required for a specific volume (20 mL in this case), we can set up a proportion based on the definition of percentage concentration.

1. A 10% solution contains 10 grams of solute per 100 mL of solution. To find out how many grams of solute are in 20 mL, we can set up a ratio:

\[

\text{Grams of Solute} = \left( \frac{10 \text{ grams}}{100 \text{ mL}} \right) \times 20 \text{ mL}

\]

2. After performing the calculation:

\[

\left( \frac{10}{100} \right) \times 20 = \frac{10 \times 20}{100} = \frac{200}{100} = 2 \text{ grams}

\]

Therefore, to prepare 20 m

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