Isotonic solutions (Two dilute solutions are isotonic when iC matches (using same concentration unit, usually)

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Two dilute solutions are isotonic when iC matches (using same concentration unit, usually molarity)

What each symbol means

SymbolWhat it stands for
CMolarity (mol L⁻¹) in matched units
ivan’t Hoff factor

When to use this

Same T; ideal dilute; semipermeable membrane; same solvent typically.