Lab Activity: Effect of Detergent on Surface Tension of Water

IMPORTANT

Lab Activity: Effect of Detergent on Surface Tension of Water: Overview

This Topic covers sub-topics such as Principle Involved to Study the Effect of Detergent on Surface Tension of Water and Observations Related to Study the Effect of Detergent on Surface Tension of Water

Important Questions on Lab Activity: Effect of Detergent on Surface Tension of Water

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IMPORTANT

Which one of the following statements is incorrect regarding the effect of detergent on the surface tension of water?

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Which of the following is not a cause of possible error in finding the change in height of the water if detergent is added to it?

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To calculate the surface tension of water, a student wants to find the height of the water in the capillary. He has set the apparatus for this as shown below.

 

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Which one of the following is the correct formula for the calculation of this height?

 

EASY
IMPORTANT

To study the effect of detergent on the surface tension of water, the observations for the height of the solution without detergent and with detergent are to be taken. Which of the following is a necessary precaution for this?

EASY
IMPORTANT

While studying the effect of detergent on the surface tension of water, the amount of the same detergent is increased in the solution and observations are taken again. How the height of the solution will change inside the capillary?

MEDIUM
IMPORTANT

The solutions of four detergents P, Q, R and S are taken in separate beakers. The following readings are taken by a student for the capillary tubes dipped in these solutions.

Solution Reading for the water level outside the capillary Reading for the water level outside the capillary
P 5.1 cm 7.3 cm 
Q 6.3 cm 8.5 cm
R 5.3 cm 7.8 cm
S 5.5 cm 7.5 cm

Which one is the best detergent?