What would be the equivalent ratio strength of a 10% w/v solution?
1:1
1:10
1:100
1:1,000
10:1
The Correct Answer is B
Ratio strength is a pharmaceutical convention used to express the concentration of a solution as a proportion of active solute to the total volume. A weight-in-volume (w/v) percentage represents the number of grams of a solid constituent dissolved in 100 mL of liquid. Converting between percentage and ratio requires establishing a unit-based relationship where the first term of the ratio is reduced to 1 for standardized dosage calculations.
Rationale:
A. A 1:1 ratio strength represents a 100% w/v concentration, which signifies that there is 1 g of solute for every 1 mL of total solution volume. This is a highly concentrated preparation and is far more potent than the 10% solution described in the question. In clinical practice, 1:1 concentrations are rarely utilized for standard intravenous medications due to the extreme tonicity.
B. A 1:10 ratio strength is the correct equivalent for a 10% w/v solution. By definition, 10% w/v means 10 g of solute are contained in 100 mL of solution. To express this as a ratio strength, the expression is simplified by dividing both components by 10, resulting in 1 g of solute per 10 mL of solution. This proportional relationship is a fundamental requirement for accurate pharmacy compounding and labeling.
C. A 1:100 ratio strength is equivalent to a 1% w/v solution, as it denotes 1 g of drug in 100 mL of liquid. This concentration is 10 times weaker than the 10% w/v solution specified in the stem. Misinterpreting this decimal placement in a clinical setting could lead to a significant sub-therapeutic dosing error for the patient.
D. A 1:1,000 ratio strength represents a 0.1% w/v solution, commonly seen in medications like epinephrine for specific emergency applications. This value is 100 times more dilute than a 10% w/v solution. Understanding the difference between these magnitude orders is critical for nursing staff to ensure that the medication administered matches the prescriber's intended potency.
E. A 10:1 ratio strength is an unconventional expression that would imply 10 g of solute in 1 mL of solution, which is a 1,000% w/v concentration. Such a solution would exceed the solubility limits of almost any pharmaceutical compound in water. Ratio strengths are traditionally formatted with the solute as the unit value of 1 to facilitate straightforward clinical calculations.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
Lactulose is a synthetic disaccharide consisting of galactose and fructose that remains unabsorbed in the small intestine. It functions as an osmotic agent, drawing water into the colonic lumen to soften stool and stimulate peristalsis. Additionally, it is used to manage hepatic encephalopathy by acidifying the gut and converting ammonia to unabsorbable ammonium ions. It is a vital medication for both gastrointestinal and hepatic disorders.
Rationale:
A. Laxative is the correct therapeutic class. Specifically, lactulose is an osmotic laxative. By increasing the osmotic pressure in the colon, it promotes fluid retention and increases bowel motility. It is commonly used for chronic constipation and is particularly effective when a soft stool is required to prevent straining during defecation in high-risk cardiac or surgical patients.
B. Antidepressants are medications used to treat mood disorders by modulating neurotransmitters like serotonin and norepinephrine. Lactulose has no pharmacological activity in the central nervous system related to mood regulation. It does not cross the blood-brain barrier in significant amounts and lacks affinity for monoamine transporters. Therefore, it has no utility in treating clinical depression.
C. Antipsychotics are used to manage symptoms of schizophrenia and bipolar disorder by blocking dopamine receptors. Lactulose is a sugar derivative that stays within the gastrointestinal tract and does not interact with dopaminergic pathways. Its therapeutic effects are restricted to osmotic and acid-base changes in the bowel, rendering it useless for the management of psychosis or hallucinations.
D. Antidiabetics are agents that lower blood glucose levels, such as metformin or insulin. Despite being a disaccharide, lactulose is not absorbed and therefore does not raise or lower serum glucose significantly. It is not used to treat hyperglycemia; in fact, diabetic patients must use it with caution as small amounts of free sugars may be present in the solution.
Correct Answer is B
Explanation
Effective patient counseling requires a transition from technical jargon to "lay language" to ensure patient understanding and health literacy. While medical terminology is essential for interprofessional communication, it often acts as a barrier when communicating with patients. The goal of counseling is to improve medication adherence and health outcomes by providing information in a way that the patient can easily interpret and act upon.
Rationale:
A. Selecting True is incorrect because technical terminology often leads to patient confusion and reduced health literacy. Patients who do not understand instructions such as "sublingual" or "hypertension" are at higher risk for medication errors. Using "under the tongue" or "high blood pressure" is more effective. Concise counseling is useless if the patient cannot decode the specialized medical vocabulary used.
B. False is the correct answer because professional standards emphasize using plain, non-technical language during patient interactions. Clear communication is the foundation of the pharmacist-patient relationship. Avoiding jargon ensures that the patient understands the purpose, administration, and risks of their therapy. Accurate counseling relies on the patient's comprehension of the information, not the use of complex medical terminology.
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