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1. Question
14. What is the amount of local anesthetic in a cartridge with 3% local anesthetic and a volume of 2 mL?
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The correct answer is D. The percentage of local anesthetic is measured in grams per 100mL (i.e., 1% is 1 g/100 mL or 1,000 mg/100 mL or 10 mg/mL). Therefore, the concentration in a 3% solution is 30 mg/mL. In 2 ml of this solution, there would be 60 mg of local anesthetic. Answer choice A is incorrect because 60 mg/mL is the concentration, and not the amount, in a cartridge with 6% local anesthetic. In answer choice B, there is 30 mg/mL in a 3% local anesthetic. Since there is a volume of 2 mL, the total amount of local anesthetic is
60 mg. Answer choice C is incorrect because this is the amount of local anesthetic in 1 mL of a 3% local anesthetic.Incorrect
The correct answer is D. The percentage of local anesthetic is measured in grams per 100mL (i.e., 1% is 1 g/100 mL or 1,000 mg/100 mL or 10 mg/mL). Therefore, the concentration in a 3% solution is 30 mg/mL. In 2 ml of this solution, there would be 60 mg of local anesthetic. Answer choice A is incorrect because 60 mg/mL is the concentration, and not the amount, in a cartridge with 6% local anesthetic. In answer choice B, there is 30 mg/mL in a 3% local anesthetic. Since there is a volume of 2 mL, the total amount of local anesthetic is
60 mg. Answer choice C is incorrect because this is the amount of local anesthetic in 1 mL of a 3% local anesthetic.