NAPLEX Flashcards: Osmolarity And Osmolality

Study Osmolarity And Osmolality in NAPLEX with focused flashcards that help you recognize the idea, recall the key rule, and apply it in practice-style prompts.

QUESTION

Calculate osmolarity for $0.15$ M NaCl (assume $i=2$ ). What is the osmolarity?

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ANSWER

$0.30$ Osm/L (= $300$ mOsm/L). NaCl dissociates into two ions ( $i=2$ ), making osmolarity twice the molarity, resulting in $0.30$ Osm/L.

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What this deck covers

This deck focuses on Osmolarity And Osmolality, giving you a quick way to review the definitions, rules, and examples that matter most for NAPLEX.

How to use these flashcards

Work through these flashcards in short sessions. Try to answer each prompt before flipping the card, then revisit any cards you miss until the explanation feels automatic.

Practice questions

1 of 22Practice questions for this set

A 38-year-old female (weight 58 kg) presents with severe diarrhea and muscle cramps. Medical history: irritable bowel syndrome; no renal or hepatic dysfunction. Current medications: dicyclomine 20 mg PO four times daily as needed. Labs: serum sodium 134 mEq/L (135–145), glucose 80 mg/dL (70–100), BUN 10 mg/dL (7–20). What is the calculated osmolarity of this patient's serum using

\text{Osm} = 2\times\text{Na} + \frac{\text{glucose}}{18} + \frac{\text{BUN}}{2.8}

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