Crystalloid and colloid can be distinguished by 

Options

A. diffusion through membrane
B. particle size
C. solubility
D. chemical composition

Answer

To distinguish between crystalloid and colloid, we can follow these steps:

### Step 1: Understand the Definitions
- **Crystalloid**: These are substances that, when dissolved in a solvent, form a true solution. The particles of crystalloid are typically small enough (less than 1 nm) to pass through a semipermeable membrane.
- **Colloid**: These are mixtures where the particle size is larger (between 1 nm and 1000 nm) and do not settle out upon standing. Colloids do not form true solutions and can scatter light (Tyndall effect).

### Step 2: Compare Particle Size
- **Crystalloid**: The particle size is considerably smaller than that of colloids. This is a key distinguishing feature.
- **Colloid**: The particle size is larger than that of crystalloid, which allows for different behaviors in solutions.

### Step 3: Perform a Simple Test
- **Test for Particle Size**: You can use a semipermeable membrane to filter the solution. If the particles pass through, it indicates a crystalloid. If they do not pass through, it indicates a colloid.

### Step 4: Observe the Tyndall Effect
- **Tyndall Effect**: Shine a beam of light through the solution. If you can see the beam of light scattering, it indicates that the solution is a colloid. If there is no scattering, it is likely a crystalloid.

### Conclusion
By comparing the particle size and observing the Tyndall effect, we can effectively distinguish between crystalloid and colloid.

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