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JEE • Chemistry

Solution & Colligative Properties

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formula

Osmotic Pressure

The solution chapter starts with osmotic pressure and the Van't Hoff osmotic-pressure relation.

π=ρgh\pi=\rho gh
π=CST\pi=CST
π=CRT=nVRT\pi=CRT=\frac{n}{V}RT
C=C1+C2+C3+⋯=n1+n2+n3+⋯VC=C_1+C_2+C_3+\cdots=\frac{n_1+n_2+n_3+\cdots}{V}
π=(C1V1+C2V2V1+V2)RT\pi=\left(\frac{C_1V_1+C_2V_2}{V_1+V_2}\right)RT

Variables & Notation

π\pi

osmotic pressure

RR

gas constant

TT

temperature

Notes

  • Isotonic solutions have the same osmotic pressure at the same temperature.

  • If π1>π2\pi_1>\pi_2, solution 1 is hypertonic with respect to solution 2.