A solution is labelled 4% w/v. How much drug is present in 250 mL of this solution?
Correct answer: D. 10 g
- A. 1 g
- B. 4 g
- C. 8 g
- D. 10 g
Explanation
A 4% w/v solution contains 4 g in every 100 mL. For 250 mL, the amount is 4 × 250 ÷ 100 = 10 g. The percentage is not 4 g in the entire container.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? support@testustad.com
About Drug Calculations and Dosage
Drug calculations apply measurement systems, unit conversions, dosage formulas, tablet and liquid doses, percentage and ratio strength, and weight based dosing. Work also includes calculating IV flow rates, infusion times and doses for children, while distinguishing the prescribed dose from the available concentration.
Practise Drug Calculations and Dosage
50 free Drug Calculations and Dosage MCQs from Nursing Pharmacology, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Nursing Pharmacology questions like this
Nursing Pharmacology is on 8 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Drug Calculations and Dosage questions
A medicine is prescribed at 24 mg/kg/day for a child weighing 22 kg, divided into four equal doses. The liquid contains 120 mg in 5 mL. How many millilitres should the nurse give per dose?
A patient is prescribed 0.4 mg of a medicine. The available tablets contain 200 micrograms each. How many tablets should the nurse administer?
An IV bag contains 250 mL and is running at 50 mL per hour. How long will the infusion take to complete?
A vial is reconstituted to a final volume of 5 mL and contains 1 g of drug. The prescription is for 600 mg. What volume should the nurse withdraw?
The ratio strength of an injection is 1:1,000. Which concentration does this represent?
During an IV infusion, the nurse counts 36 drops in 30 seconds. The giving set delivers 15 drops per millilitre. What is the approximate flow rate in millilitres per hour?