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The problem asks to calculate the mass of ketamine in 2.50 mL of a 1.0% (w/v) solution. Here's how you solve it:

### Step-by-Step Solution:

1. **Understanding the % (w/v) solution**:
   - A 1.0% (w/v) solution means 1.0 g of solute (ketamine) is present in 100 mL of solution.

2. **Determine the mass of ketamine in 2.50 mL**:
   Using the ratio:
   \[
   \frac{1.0 \, \text{g}}{100 \, \text{mL}} = \frac{x \, \text{g}}{2.50 \, \text{mL}}
   \]
   Solve for \(x\), which represents the mass of ketamine in 2.50 mL.

3. **Solve for \(x\)**:
   \[
   x = \frac{1.0 \, \text{g} \times 2.50 \, \text{mL}}{100 \, \text{mL}} = 0.025 \, \text{g}
   \]

### Final Answer:
The mass of ketamine in 2.50 mL of solution is **0.025 g**.

Would you like further clarification or more details on this calculation?

Here are 5 related questions to expand your understanding:
1. How does a w/v solution differ from a v/v or w/w solution?
2. How would you calculate the mass of ketamine if the concentration were 2.0% instead of 1.0%?
3. What is the significance of significant digits in this calculation?
4. How would the calculation change if the volume were given in liters instead of milliliters?
5. How could you determine the volume needed to obtain 0.1 g of ketamine from the same 1.0% solution?

**Tip**: Always keep track of units when performing calculations, especially when dealing with concentrations.

Calculate the mass of ketamine in 2.50 mL of a 1.0% (w/v) solution.

Learn how to calculate the mass of ketamine in 2.50 mL of a 1.0% (w/v) solution using ratio and proportion techniques. This solution applies fundamental chemistry concepts such as percentage concentration and unit conversion. Suitable for high school students.

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