Question
Download Solution PDFAddition of detergent to liquid
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFCONCEPT:
Surface Tension (σ) of a liquid:
- It is defined as the force per unit length in the plane of the liquid surface at right angles to either side of an imaginary line drawn on that surface.
- The SI unit of surface tension is N/m.
Mathematically, σ = F/L
where, σ = surface tension of liquid, F = force , L = length.
EXPLANATION:
- Surface tension is the result of the cohesive force among the liquid molecules, which always tries to make the surface area of the liquid droplet minimum.
- The spherical shape of the drop is also the reason for surface tension.
- Detergent is sparingly soluble in water.
- The surface tension decreases when detergent is added to water.
Effect of impurities and temperature on surface tension:
|
Impurities |
Surface Tension |
|
The highly soluble substance in water |
Increases the ST |
|
Sparingly soluble substance |
Reduces the ST |
|
Temperature |
Surface Tension |
|
High Temperature |
Decrease the ST |
|
Low Temperature |
Increase the ST |
Last updated on May 30, 2025
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