A 10% solution has how many milligrams per milliliter?

• A. 100 mg/mL
• B. 10 mg/mL
• C. 1000 mg/mL
• D. 1 mg/mL

Answer: (C)

A 10% solution means 10 grams of solute in 100 milliliters of solution. Convert to milligrams: 10 g = 10,000 mg. Then 10,000 mg / 100 mL = 100 mg/mL. So, a 10% solution is 100 mg per milliliter. For context, 1% w/v equals 10 mg/mL, and 100% w/v equals 1000 mg/mL (1 g/mL). The value 1000 mg/mL corresponds to 100% solution, not 10%.