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

To find the amount of lidocaine in a 10 mL solution of 5% lidocaine, we first need to understand that a 5% solution means there are 5 grams of lidocaine per 100 mL of solution.

Here's the calculation:

1. **Find the amount of lidocaine per mL:**
   \[
   \text{Lidocaine concentration} = \frac{5 \text{ g}}{100 \text{ mL}} = 0.05 \text{ g/mL}
   \]

2. **Calculate the amount of lidocaine in 10 mL:**
   \[
   \text{Lidocaine in 10 mL} = 0.05 \text{ g/mL} \times 10 \text{ mL} = 0.5 \text{ g}
   \]

3. **Convert grams to milligrams (mg):**
   \[
   0.5 \text{ g} = 0.5 \text{ g} \times 1000 \frac{\text{mg}}{\text{g}} = 500 \text{ mg}
   \]

Thus, there are **500 mg of lidocaine** in 10 mL of a 5% lidocaine solution.

Would you like more details on this calculation or have any other questions?

### Follow-up Questions

1. How would you calculate the amount of lidocaine in a different volume of solution?
2. What is the process for converting percentage concentrations to mg/mL?
3. How does the percentage concentration of a solution affect the dosage calculations?
4. If the solution was 2%, how many mg of lidocaine would be in 10 mL?
5. What is the difference between weight/volume percentage and volume/volume percentage in solutions?
6. How would you prepare a 5% solution from a more concentrated stock solution?
7. What is the importance of accurate dosage calculation in pharmaceuticals?
8. How would the dosage calculation change if the lidocaine concentration were given in mg/mL?

### Tip

Always ensure you convert units properly when dealing with medical dosages, as accurate dosage calculations are crucial for patient safety.

Understand how to calculate the lidocaine content in a 5% lidocaine solution, specifically 500 mg in 10 mL. This problem involves percentage concentration and unit conversion, essential in pharmaceutical calculations.

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