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Molecular mass of NaCl determine by osmo...

Molecular mass of NaCl determine by osmotic pressure measurement is found to be half of the actual value. Account for it .

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It is due to dissociation of NaCl to `Na^+` and `Cl^(-1)` ions. So the colligative properties will be almost double and hence the molecular mass calculated will be almost half of the actual molecular mass.
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