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Question
In 0.1 M solution of a non electrolyte, Ψw value will be
In 0.1 M solution of a non electrolyte, Ψw value will be
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Solution
The correct option is B - 24.7 bar
Water potential is the potential due to water molecules in the solution. More the number of water molecules greater the water potential. By convention, water potential of pure water is fixed at zero which is its maximum value. Hence, water potential of all solutions is negative. Water potential of a solution can be calculated using the equation PV = nRT. Substitute 0.1 for n; 298 for T; 0.832 for R and unity for volume. On solving we get the value of P as 24.7 bars. The important point to note is the term "non electrolyte" because non electrolytes do not ionize, the number of moles do not change. Hence, we could directly substitute the value of molarity in place of n. Otherwise we would have to suitably modify the value of n depending on whether each molecule of electrolyte ionises to give two or three ions or more ions.
Water potential is the potential due to water molecules in the solution. More the number of water molecules greater the water potential. By convention, water potential of pure water is fixed at zero which is its maximum value. Hence, water potential of all solutions is negative.
Water potential of a solution can be calculated using the equation PV = nRT. Substitute 0.1 for n; 298 for T; 0.832 for R and unity for volume.
On solving we get the value of P as 24.7 bars.
The important point to note is the term "non electrolyte" because non electrolytes do not ionize, the number of moles do not change.
Hence, we could directly substitute the value of molarity in place of n. Otherwise we would have to suitably modify the value of n depending on whether each molecule of electrolyte ionises to give two or three ions or more ions.
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