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What will be the water potential of solution B, if its solute potential Ψs at atmospheric pressure is –200 Pa?

GeneralClass 12AllAnswered 27 Mar 2026
Answer

At atmospheric pressure, the pressure potential (Ψ<sub>p</sub>) = 0

Using the formula:

Ψ<sub>w</sub> = Ψ<sub>s</sub> + Ψ<sub>p</sub>

Ψ<sub>w</sub> = (–200 Pa) + 0 = –200 Pa

Therefore, the water potential of solution B = –200 Pa

Key Principle: At atmospheric pressure (standard conditions), water potential equals solute potential because no external pressure is applied.

Units: Water potential is commonly expressed in:

  • Pascals (Pa) – SI unit
  • Megapascals (MPa) – 1 MPa = 10⁶ Pa
  • Bars – 1 bar ≈ 0.1 MPa ≈ 100 kPa

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General · Class 12