A pharmacist has 5% lidocaine solution. how many milligrams of lidocaine are in 10 mL of this solution?

To determine how many milligrams of lidocaine are in 10 mL of a 5% lidocaine solution, we can follow these steps:

1. **Understand the percentage concentration**: A 5% lidocaine solution means there are 5 grams of lidocaine in every 100 mL of solution.

2. **Convert grams to milligrams**: Since 1 gram is equivalent to 1000 milligrams, 5 grams is equal to 5000 milligrams.

3. **Set up a proportion to find the amount in 10 mL**:
   
   \[
   \frac{5000 \text{ mg}}{100 \text{ mL}} = x \text{ mg in 10 mL}
   \]

4. **Solve for \( x \)**: 

   \[
   x = \left( \frac{5000 \text{ mg}}{100 \text{ mL}} \right) \times 10 \text{ mL}
   \]

5. **Calculate the result**:

   \[
   x = 500 \text{ mg}
   \]

So, there are **500 milligrams of lidocaine** in 10 mL of a 5% lidocaine solution.

Would you like more details or have any questions about this calculation? Here are some related questions for further exploration:

1. How would you calculate the amount of lidocaine in 50 mL of the same 5% solution?
2. What would be the lidocaine concentration in a solution containing 2500 mg of lidocaine in 50 mL?
3. If a solution has 750 mg of lidocaine in 15 mL, what is the percentage concentration?
4. How do you prepare 20 mL of a 2% lidocaine solution from a 10% lidocaine stock solution?
5. What volume of a 5% lidocaine solution is needed to obtain 1000 mg of lidocaine?
6. How many milliliters of a 2% lidocaine solution are equivalent to 500 mg of lidocaine?
7. How would you dilute a 5% lidocaine solution to obtain 200 mL of a 1% solution?
8. What is the maximum safe dose of lidocaine for an adult, and how does this relate to the concentration and volume administered?

**Tip:** Always double-check the units (mg, mL, %) when performing calculations with concentrations to ensure accuracy.

Learn how to calculate the amount of lidocaine in 10 mL of a 5% lidocaine solution. This problem involves understanding percentage concentration and unit conversion from grams to milligrams. Suitable for Grades 9-12.

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