The Question is from neet-chemistry , and it was created by the author A.RAMA NAGESWARARAO

Question

Glycerol can be separated from spent-lye in soap industry by

A.RAMA NAGESWARARAO · Accepted Answer

## CORE INFORMATION
✓ **Answer**: C
## CONCEPT FRAMEWORK
	**Primary Concept**: Distillation Techniques
	**Related Topics**: Boiling Point, Vapor Pressure, Vacuum Distillation
	**Prerequisites**: Understanding of distillation and its variations
## SOLUTION PATHWAY
**Given Information**:
	* Spent-lye contains glycerol and other compounds.
	* Glycerol has a high boiling point.
**Method & Steps**:
	1. **Identify the Challenge:** Glycerol has a high boiling point, which makes ordinary distillation difficult and potentially damaging.
		Reasoning: High temperatures can cause decomposition.
	2. **Evaluate Distillation Options:**
		* Steam distillation: Used for volatile compounds, not suitable for glycerol.
		* Fractional distillation: Used for separating liquids with different boiling points, not ideal for glycerol's high boiling point.
		* Ordinary distillation: Requires high temperatures to boil glycerol, can lead to decomposition.
		* Distillation under reduced pressure: Lowers the boiling point of glycerol, making distillation easier and preventing decomposition.
		Key Point: Reduced pressure reduces the boiling point of the liquid.
	3. **Conclusion**: Distillation under reduced pressure is the most suitable method for separating glycerol from spent lye.
		Result: The correct method is distillation under reduced pressure.
		Verification: This method is commonly used in industrial processes.
## OPTION ANALYSIS
[A] :x: Steam distillation is not suitable for separating glycerol due to its low volatility.
[B] :x: Fractional distillation is used for separating liquids with different boiling points, but it is not ideal for glycerol with a very high boiling point.
[C] ✓: Distillation under reduced pressure lowers the boiling point of glycerol, making it easier to separate without decomposition.
[D] :x: Ordinary distillation would require very high temperatures that can cause decomposition of glycerol.
## LEARNING AIDS
	**Common Mistakes**:
		1. Confusing steam distillation with reduced pressure distillation: Steam distillation is for volatile compounds, while reduced pressure distillation lowers boiling points.
		2. Not considering the high boiling point of glycerol: This leads to choosing incorrect methods that require very high temperatures.
	**Quick Tips**:
		1. Remember that reduced pressure lowers the boiling point.
		2. Think about the properties of glycerol (high boiling point) when choosing separation techniques.

A.RAMA NAGESWARARAO · Answer

Steam distillation

A.RAMA NAGESWARARAO · Answer

Fractional distillation

A.RAMA NAGESWARARAO · Answer

The correct Option is "Distillation under reduced pressure"

A.RAMA NAGESWARARAO · Answer

Ordinary distillation

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