Dichloro Diphenyl Trichloroethane(DDT) is-
More soluble in fat than water
Understanding DDT Solubility
The question asks about the solubility characteristics of Dichloro Diphenyl Trichloroethane, commonly known as DDT. Solubility refers to the ability of a substance (solute) to dissolve in a solvent, forming a solution.
Chemical compounds have different solubilities depending on their structure and the nature of the solvent. Water is a polar solvent, meaning it has a positive and negative end due to uneven distribution of electrons. Fat, or lipids, are non-polar solvents. Generally, "like dissolves like." This means polar substances tend to dissolve in polar solvents like water, and non-polar substances tend to dissolve in non-polar solvents like fat.
Chemical Nature of DDT
DDT is an organochlorine compound. Its chemical structure consists mainly of carbon, hydrogen, and chlorine atoms. While it has some polar bonds (like C-Cl), the overall molecule is large and predominantly non-polar due to the presence of large non-polar hydrocarbon parts and the symmetrical arrangement of the molecule.
DDT Solubility in Fat vs. Water
Because DDT is a predominantly non-polar molecule, it exhibits a high affinity for non-polar solvents. Fats and lipids are non-polar. Water is a polar solvent. Therefore, DDT is:
- Highly soluble in fats, oils, and organic solvents.
- Very poorly soluble in water.
This property of being much more soluble in fat than water is crucial to understanding how DDT behaves in the environment and in living organisms, leading to issues like bioaccumulation.
Analyzing the Options
Let's look at the options provided based on our understanding of DDT's solubility:
- More soluble in fat than water: This statement aligns with the chemical properties of DDT as a non-polar organochlorine compound.
- Less soluble in fat than water: This is incorrect. DDT is much more soluble in fat.
- Not soluble in water: While its solubility in water is very low, it is not completely insoluble. This statement is an oversimplification and less accurate than comparing its solubility relative to fat.
- Not soluble in fat: This is incorrect. DDT is highly soluble in fat.
Based on the analysis, the most accurate description among the given options is that DDT is more soluble in fat than water.
Revision Table: DDT Properties
| Property | Description |
|---|---|
| Chemical Type | Organochlorine Pesticide |
| Solubility in Water | Very Low (poorly soluble) |
| Solubility in Fat/Lipids | High (highly soluble) |
| Nature (Polar/Non-polar) | Predominantly Non-polar |
Additional Information: Environmental Impact and Bioaccumulation
The high solubility of DDT in fat has significant environmental and health implications. When organisms ingest or absorb DDT, it tends to accumulate in their fatty tissues rather than being easily excreted in water-based bodily fluids. This leads to a process called bioaccumulation, where the concentration of DDT increases in an organism over time. Furthermore, as it moves up the food chain, the concentration of DDT can increase at each trophic level, a process known as biomagnification. This has caused significant harm to wildlife, particularly birds of prey, and raised concerns about potential human health effects.
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Statement II: The grade of petroleum depends mainly on the relative proportion of the different hydrocarbons.
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