Question

In 0.1 M solution of a non-electolyte , $\psi$${}_w$Ψ (water potential) value will be

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

Answer 1

The correct option is C -2.3 bar

Water potential of pure water is zero.

As a solute is added, water potential decreases and becomes negative.

Water potential can be calculated as:

ψ (water potential) = ψ P (pressure potential) + ψ S (solute potential)

For the 0.1 M solution of a non electrolyte, ψ P is 0 bar and is ψ S is -2.3 bar

So,

ψ = 0 bar + (-2.3 bar)

ψ = -2.3 bar

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