How much local anesthetic is there in a dental cartridge of 1% concentration (1.8 ml cartridge)?

How much local anesthetic is there in a dental cartridge of 1% concentration (1.8 ml cartridge)?

• A. 9 mg
• B. 18 mg
• C. 36 mg
• D. 54 mg

Answer: (B)

To determine the amount of local anesthetic in a dental cartridge with a concentration of 1%, you start by understanding what the concentration means. A 1% solution indicates that there is 1 gram of anesthetic in 100 ml of solution. To find out how much anesthetic is in a smaller volume, such as a 1.8 ml cartridge, you can use the following calculation: 1. First, convert the percentage to a concentration in milligrams for clarity. Since 1% equals 10 mg/ml, we can directly say that in 1 ml of a 1% solution, there are 10 milligrams of the anesthetic. 2. Then, multiply the concentration (10 mg/ml) by the volume of the cartridge (1.8 ml): \( 10 \, \text{mg/ml} \times 1.8 \, \text{ml} = 18 \, \text{mg} \) Thus, the amount of local anesthetic in a 1.8 ml cartridge of 1% solution is 18 mg. This calculation confirms that the correct answer is indeed 18 mg, which is why it is the right choice among the alternatives provided.

To determine the amount of local anesthetic in a dental cartridge with a concentration of 1%, you start by understanding what the concentration means. A 1% solution indicates that there is 1 gram of anesthetic in 100 ml of solution. To find out how much anesthetic is in a smaller volume, such as a 1.8 ml cartridge, you can use the following calculation:

1. First, convert the percentage to a concentration in milligrams for clarity. Since 1% equals 10 mg/ml, we can directly say that in 1 ml of a 1% solution, there are 10 milligrams of the anesthetic.

2. Then, multiply the concentration (10 mg/ml) by the volume of the cartridge (1.8 ml):

( 10 , \text{mg/ml} \times 1.8 , \text{ml} = 18 , \text{mg} )

Thus, the amount of local anesthetic in a 1.8 ml cartridge of 1% solution is 18 mg. This calculation confirms that the correct answer is indeed 18 mg, which is why it is the right choice among the alternatives provided.