Theoretically, water potential of the pure water is taken as

Options

A. Zero
B. 100
C. Negative
D. Positive

Answer

To determine the theoretical water potential of pure water, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Water Potential**: Water potential is a measure of the potential energy in water and is used to predict the direction in which water will move. It is influenced by solute concentration and pressure.

2. **Pure Water Characteristics**: Pure water is defined as water that contains no solutes. This means that it has the highest concentration of free water molecules.

3. **Kinetic Energy of Water Molecules**: The water molecules in pure water possess kinetic energy, which contributes to its water potential. The more free water molecules present, the higher the kinetic energy and, consequently, the higher the water potential.

4. **Water Potential of Pure Water**: Since pure water has the maximum number of free water molecules and no solutes, it is assigned a water potential of zero. This is the reference point for measuring water potential in other solutions.

5. **Effect of Solutes**: When solutes are added to water, the number of free water molecules decreases, which lowers the water potential. Therefore, the water potential of solutions with solutes will always be negative relative to pure water.

6. **Conclusion**: Theoretically, the water potential of pure water is taken as 0.

### Final Answer:
Theoretically, the water potential of pure water is taken as **0**.

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