Question

White – Vincent method is used for

• A. Viscosity measurement
• B. Surface tension measurement
• C. Osmotic pressure measurement
• D. Isotonicity adjustment

Hint:

Surface tension measurement is essential in understanding the behavior of liquids. The White-Vincent method is a popular technique for this measurement.

Answer 1

The Correct Option is B

Step 1: Understanding the White-Vincent method.
The White-Vincent method is commonly used to measure the surface tension of liquids, which helps in understanding the properties of liquids like water and solvents. This method is particularly useful in various chemical and pharmaceutical applications.
Step 2: Analyzing the options.
(1) Viscosity measurement: Incorrect, the White-Vincent method is not used for viscosity measurement.
(2) Surface tension measurement: Correct — The White-Vincent method is designed to measure the surface tension of liquids.
(3) Osmotic pressure measurement: Incorrect, this method is unrelated to osmotic pressure.
(4) Isotonicity adjustment: Incorrect, isotonicity adjustments are not related to this method.
Step 3: Conclusion.
The White-Vincent method is used for (2) Surface tension measurement.

Answer 2

The White-Vincent method is applied to characterizing a specific physical property of liquids. Let's evaluate what each option would actually require and see which one matches this method's purpose.

1. Viscosity measurement: Viscosity is typically measured with viscometers (such as capillary, rotational, or falling-ball types), not with the White-Vincent approach, so this does not match.
2. Surface tension measurement: The White-Vincent method is used to determine surface tension by measuring how a liquid behaves under controlled conditions related to its surface properties, which is exactly the property this method targets.
3. Osmotic pressure measurement: Osmotic pressure is generally assessed using osmometers based on colligative properties like freezing point depression, which is unrelated to the White-Vincent technique.
4. Isotonicity adjustment: Isotonicity adjustment is a formulation calculation (such as using the sodium chloride equivalent or freezing point depression methods), not a measurement technique like White-Vincent.

Only surface tension measurement lines up with what the White-Vincent method is designed to determine.

Therefore, the correct answer is Surface tension measurement.