Using very little soap while washing clothes , does not serve the purpose of cleaning of clothes because :

Options

A. soap particle remain floating in water as ions
B. the hydrophobic part of soap is not able to take away grease
C. the micelles are not formed due to concentration of soap , below its CMC value
D. colloidal structure of soap in water is completely disturbed .

Explanation

To solve the question regarding why using very little soap while washing clothes does not effectively clean them, we can break it down into the following steps:

### Step 1: Understanding Soap and Its Function
Soap is a surfactant that helps to remove dirt and grease from clothes. It works by reducing the surface tension of water and allowing it to mix with oils and dirt.

**Hint:** Consider how soap interacts with water and dirt.

### Step 2: The Concept of Micelles
When soap is added to water, it forms structures called micelles. Micelles are formed when soap molecules arrange themselves in a spherical shape, with the hydrophobic (water-repelling) tails pointing inward and the hydrophilic (water-attracting) heads pointing outward. This arrangement allows micelles to trap dirt and grease.

**Hint:** Think about the structure of soap molecules and how they behave in water.

### Step 3: Critical Micelle Concentration (CMC)
There is a specific concentration of soap in water known as the Critical Micelle Concentration (CMC). Below this concentration, soap molecules do not aggregate to form micelles. If the concentration of soap is below the CMC, it cannot effectively trap dirt and grease.

**Hint:** Recall the importance of concentration in chemical reactions and formations.

### Step 4: Conclusion
Using very little soap means that the concentration is likely below the CMC, which prevents micelle formation. Without micelles, the soap cannot effectively remove dirt and grease from the clothes, leading to ineffective cleaning.

**Hint:** Relate the concept of CMC to the effectiveness of soap in cleaning.

### Final Answer
Using very little soap while washing clothes does not serve the purpose of cleaning because the concentration of soap is below the Critical Micelle Concentration (CMC), preventing the formation of micelles that are necessary for trapping and removing dirt and grease.