Identify the correct sentence:

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(A) The water potential $(\Psi_w)$ of pure water at standard temperature and pressure is defined as zero.When solutes are added to pure water,the solu

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Water potential $(\Psi_w)$ of a solution is lower compared to the water potential of pure water.

Vedclass · Answer

(A) The water potential $(\Psi_w)$ of pure water at standard temperature and pressure is defined as zero.When solutes are added to pure water,the solution becomes more concentrated,which decreases the free energy of water molecules.Therefore,the water potential of a solution is always lower than that of pure water (i.e.,it is negative).$\Psi_s$ (solute potential) is always negative because the addition of solutes lowers the water potential.For pure water,$\Psi_w = \Psi_s + \Psi_p$. Since $\Psi_s = 0$ and $\Psi_p = 0$ for pure water,$\Psi_w = 0$. Thus,option $A$ is correct.

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