Question

In 0.1 M solution of a non electrolyte, ${\psi }_w$ value will be

• A. Zero bar
• B. +2.3 bar
• C. -2.3 bar
• D. -22.4 bar

Answer 1

Answer: (C)

-2.3 bar

The water potential of pure water is zero. Water potential is total of solute potential and pressure potential. Here, the pressure potential is zero.

Hence, the water potential = solute potential = -iCRT where,

i = ionization constant = 1

C = 0.1 M

R = pressure constant = 0.08314 litre/mole

T = Temperature 298 K.

Hence, water potential = -1 x 0.1 x 0.08314 x 298 = -2.3 bar.

Thus, the correct answer is '-2.3 bar.'