I keep getting “Concentration terms” questions wrong in Some Basic Concepts (Mole Concept). What's the trap?
thinking molarity and molality are interchangeable.
The usual trap: thinking molarity and molality are interchangeable. How to avoid it: molarity changes with temperature (volume expands); molality doesn't. Go back to the definition — molarity is moles of solute per litre of solution; molality is moles per kilogram of solvent.
Key point
Concentration terms
Common mistake
thinking molarity and molality are interchangeable.
Memory tip
molarity changes with temperature (volume expands); molality doesn't.
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