Question

Position of non polar & polar part in miscell

• A. Polar at outer surface but non polar at innersurface
• B. Polar at inner surface non polar at outer surface
• C. Distributed over all the surface
• D. Are present in the surface only

Answer 1

The Correct Option is A

To address the question regarding the position of non-polar and polar parts in a micelle, we need to understand the structure of a micelle and how its components arrange themselves:

Micelles are spherical aggregates formed by surfactant molecules when they are in a solvent, typically water. Surfactant molecules usually contain a hydrophilic (polar) head and a hydrophobic (non-polar) tail. The orientation and arrangement of these molecules form the basic structure of a micelle:

1. Hydrophilic (Polar) Heads: These are attracted to water and tend to position themselves on the outer surface of the micelle, in contact with the aqueous environment.
2. Hydrophobic (Non-Polar) Tails: These are repelled by water, so they cluster together on the inside of the micelle, away from the water, forming the core.

This specific arrangement helps in minimizing the free energy in the system by reducing the contact of hydrophobic tails with water. This structure allows micelles to dissolve hydrophobic substances in their core, which is the essence of their 'cleaning' or 'solubilizing' action.

Given the options, the correct statement regarding the position of non-polar and polar parts in a micelle is:

Polar at outer surface but non polar at innersurface

This is because the polar heads are indeed at the outer surface, interacting with water, while the non-polar tails are sequestered in the inner core of the micelle.