Question

Which of the following molecular properties can be determined by Themogravimetric Analysis?

• A. Solubility
• B. Hygroscopicity
• C. Colour stability
• D. Hydrolysis

Answer 1

The Correct Option is B

To determine which molecular property can be assessed using Thermogravimetric Analysis (TGA), we need to understand the principle of TGA. TGA is a thermal analysis technique that measures the change in the weight of a material as a function of temperature or time in a controlled atmosphere. Typically, TGA is used to study the thermal stability, composition, and decomposition processes of materials.

Let's evaluate the options:

1. Solubility: Solubility refers to the ability of a substance to dissolve in a solvent. Solubility is typically measured through chemical tests and is not directly determined by TGA.
2. Hygroscopicity: Hygroscopicity is the ability of a substance to absorb moisture from the air. TGA can be used to measure hygroscopicity as the sample's weight changes due to moisture uptake can be detected as a function of temperature or time. Therefore, TGA can determine this property.
3. Colour Stability: Colour stability involves maintaining or changing color under various conditions. This property is generally assessed visually or through color measurement instruments rather than TGA.
4. Hydrolysis: Hydrolysis is a chemical reaction with water that is typically studied through different chemical kinetics methods rather than TGA.

Given these evaluations, the correct answer is Hygroscopicity, as this property can be effectively measured using Thermogravimetric Analysis.

In conclusion, TGA helps analyze changes in a material's weight that occur due to moisture uptake, thermal decomposition, or other physical or chemical changes as the temperature varies, allowing it to accurately determine a material's hygroscopicity.