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","C","D","E"]
Explanation
These are some of the common symptoms of hypothyroidism, which is a condition where the thyroid gland does not produce enough thyroid hormones. Thyroid hormones regulate the body’s metabolism, temperature and heart rate.
Choice A is wrong because a pulse of 126 is too high for hypothyroidism. Hypothyroidism usually causes a slow heart rate (bradycardia), not a fast one (tachycardia). A normal resting pulse rate for adults is between 60 and 100 beats per minute.
Choice E is wrong because a pulse of 54 is within the normal range for
hypothyroidism. Hypothyroidism can cause a pulse rate lower than 60 beats per minute, but this is not always abnormal. Some people, such as athletes, may have a lower resting pulse rate due to their fitness level.
The normal ranges for thyroid function tests are:
- Thyroid-stimulating hormone (TSH): 0.4 to 4.0 milli-international units per liter (mIU/L).
- Free thyroxine (T4): 0.8 to 2.8 nanograms per deciliter (ng/dL).
- Total triiodothyronine (T3): 80 to 220 ng/dL.
Correct Answer is B
Explanation
This is because older adults have a reduced ability to excrete drugs and their metabolites through the kidneys, which can lead to drug accumulation and toxicity. Decreased renal function can also affect the pharmacokinetics and pharmacodynamics of many drugs, altering their absorption, distribution, metabolism, and elimination.
Choice A is wrong because reduced muscle mass does not directly affect drug metabolism or clearance, although it may affect the volume of distribution of some drugs that are highly protein-bound or lipophilic.
Choice C is wrong because slowed gastrointestinal motility does not increase the risk of adverse drug events in older adults, although it may affect the rate and extent of drug absorption.
Choice D is wrong because thinning of the layers of the skin does not affect drug metabolism or clearance, although it may increase the risk of skin infections or injuries.
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