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  4. When 20 g of Naphthoic acid (.C11H8O2.) is dissolved in 50 g of benzene (.Kf=1.72 Kkgmol- 1. , a freezing point depression of 2 K is observed. The Van’t Hoff factor (i) is

Q. When 20 g of Naphthoic acid is dissolved in 50 g of benzene , a freezing point depression of 2 K is observed. The Van’t Hoff factor (i) is

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Solution:

The Van 't Hoff factor(i ) (named after Dutch chemist Jacobus Henricus van 't Hoff) is a measure of the effect of a solute on colligative properties such as osmotic pressure, relative lowering in vapour pressure, boiling-point elevation and freezing-point depression. The Van 't Hoff factor is the ratio between the actual concentration of particles produced when the substance is dissolved and the concentration of a substance as calculated from its mass.


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