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Why is solute potential always negative ...

Why is solute potential always negative ? Explain `Psi_W=Psi_S+Psi_p`.

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Any solute is dissolved in pure water then molecules of free water decrease and concentration of water decreases so its water potential decreases.
So water potential of all solutions is less than pure water.
The magnitude of this lowering due to dissolution of a solute is called solute potential or `Psi_S. Psi_S` is always negative.
where `Psi_W=Psi_S+Psi_p`
`Psi_W`=water potential of water
`Psi_S`= solute potential
`Psi_p` = pressure potential.
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