When 250 mg of a medication is diluted in 500 mL of 5% dextrose in water, how many milligrams of the medication will be in 1 mL of D5W?
0.5.
50.
500.
5.
The Correct Answer is D
The question asks how many milligrams of the medication will be in 1 mL of D5W. To find this, we need to know the concentration of the medication in the solution.
Concentration is the amount of medication per unit volume of solution. We can use this formula:
Concentration = Mass / Volume
We know that 250 mg of the medication is diluted in 500 mL of D5W. So we can plug these values into the formula:
Concentration = 250 mg / 500 mL Simplifying, we get:
Concentration = 0.5 mg / mL
This means that there are 0.5 mg of the medication in every 1 mL of D5W. So the answer is
- To check our answer, we can use another formula:
Mass = Concentration x Volume
If we want to find the mass of the medication in 1 mL of D5W, we can multiply the concentration by the volume:
Mass = 0.5 mg / mL x 1 mL Simplifying, we get:
Mass = 0.5 mg
This matches our answer.
The other choices are wrong because they do not use the correct formula or values. Here is why:
Choice A is wrong because it uses the inverse of the concentration (1 / 0.5) instead of the concentration (0.5).
Choice B is wrong because it uses the mass of the medication (250 mg) instead of the concentration (0.5 mg / mL).
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
Notify the health care provider. The nurse should take this action first because the provider can prescribe appropriate interventions to prevent or minimize harm to the client.
The nurse should also inform the unit supervisor, document the error in the client’s medical record, and record the error on the appropriate quality improvement report, but these are not the priority actions.
Choice A is wrong because informing the unit supervisor is not the most urgent action. The supervisor can provide support and guidance to the nurse, but cannot prescribe interventions for the client.
Choice C is wrong because documenting the error in the client’s medical record is not the most urgent action.
The nurse should document the error after notifying the provider and assessing the client. Documentation should include the medication name, dose, route, time, client’s response, and actions taken.
Choice D is wrong because recording the error on the appropriate quality improvement report is not the most urgent action.
The nurse should record the error after notifying the provider and assessing the client. The report should include a factual description of what happened and what was done.
Correct Answer is B
Explanation
This is because anti-embolism stockings are designed to prevent swelling and blood clots in the legs by applying graduated compression, which is tighter around the ankle and looser as it moves up the leg. Applying the stockings in the morning before any swelling occurs ensures a proper fit and optimal blood flow.
Choice A is wrong because massaging the legs can dislodge a blood clot and cause a pulmonary embolism.
Choice C is wrong because wetting the stockings can make them harder to apply and reduce their effectiveness.
Choice D is wrong because removing the stockings before bathing can increase the risk of swelling and clotting, and applying fresh ones afterward can be difficult and uncomfortable.
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