Problem 44 - A Complete Resource Book in Chemistry for JEE Main

Question

The turbidity of a polymer solution measures (a) light transmitted by the solution (b) light scattered by the solution (c) a light absorbed by solution (d) none of these

Step-by-Step Solution

Answer

(b) light scattered by the solution.

Step 1: Understand Turbidity

Turbidity refers to the cloudiness or haziness of a fluid caused by large numbers of individual particles that are generally invisible to the naked eye. It is a key test of water quality.

Step 2: Focus on Light Behavior

In turbidity measurements, the primary focus is on how particles in the solution affect light. Specifically, turbid solutions usually scatter light because of the particles suspended in them.

Step 3: Determine the Nature of Turbidity

Considering the behavior of light with turbid solutions, we note that the main effect is that light passing through the solution is scattered by the particles.

Key Concepts

Understanding Light Scattering in Solutions

Light scattering occurs when light waves interact with particles present in a solution. This process causes the light to deflect from its original path. In the context of turbidity, scattered light is key. Turbidity is the degree to which particles in a solution scatter or diffuse light, rather than allowing it to pass straight through. This is why turbid solutions appear cloudy.
When light hits particles, it changes direction; this scattering affects how we perceive the clearness of the solution. In polymer solutions, where polymer chains are suspended in a liquid, light scattering becomes even more pronounced due to the size and arrangement of these chains.
Light scattering can provide insight into the presence and concentration of particulates within a solution. These insights are crucial in areas of scientific research and environmental studies, where determining the clarity of waters or solutions helps in assessing quality and composition.

Exploring Polymer Solutions

Polymer solutions are mixtures in which polymer molecules are dispersed in solvents. The behavior of these polymers in solution is influenced by factors like temperature, concentration, and molecular weight.
In the context of light scattering, polymers add complexity to solutions due to their lengthy chains and varied orientations. These factors cause irregular interactions with light.
Polymer solutions play a vital role in various industries, including pharmaceuticals, coatings, and textiles. The properties of polymer solutions, like viscosity and turbidity, are closely analyzed for quality control and product development.

• Viscosity affects how polymer solutions flow.
• Turbidity indicates the presence and distribution of polymer particles.
• Application areas demand precise control of these properties.

Understanding polymer interactions and their influence on light scattering helps in optimizing processes and ensuring desired product characteristics.

Water Quality Measurement: The Role of Turbidity

Measuring turbidity is an essential aspect of assessing water quality. Water quality is crucial for environmental health, and turbidity measurements help monitor the presence of particulates in water bodies.
This measurement determines the clarity of water and identifies contaminants like sediments, microorganisms, and pollutants. The more particles present, the higher the turbidity, indicating reduced water quality.
Effective water quality management involves continuous turbidity monitoring and control to ensure safe water supplies and protect ecosystems. Regular checks are crucial, especially after natural events like storms, which can increase turbidity.

• Turbidity is gauged using instruments called turbidimeters.
• These instruments measure light scattering to quantify turbidity levels.
• Understanding turbidity helps in preventing waterborne diseases and maintaining clean water supplies.

Being aware of turbidity and its implications aids in making informed decisions about water treatment and pollution control.