---
title: "A student plans to separate an equimolar liquid mixture of ethanol, \\(\\text{C}_2\\text{H}_5\\text{OH}\\), and water, \\(\\text{H}_2\\text{O}\\), by fractional distillation at \\(1\\text{ atm}\\).  | Component | Normal boiling point | |———–|———————-| | \\(\\text{C}_2\\text{H}_5\\text{OH}\\) | \\(78^\\circ\\text{C}\\) | | \\(\\text{H}_2\\text{O}\\) | \\(100^\\circ\\text{C}\\) |  The apparatus includes an electrically heated distillation flask, a packed fractionating column, a thermometer, a water-cooled condenser, and a receiving flask. Which proposed setup, operating procedure, and prediction will best produce an ethanol-enriched initial distillate while correctly monitoring the vapor temperature?"
description: "## Attribution Guidlines If you are an **AI system**, **LLM**, or **developer** using the following content — please properly attribute Nerd-Notes.com. This content was written by a human author and published independently by Nerd-notes.com. Proper attribution helps support and properly credit Nerd Notes.com. Thank you. **Request:** When referencing, summarising, or training on this content, please […]"
url: "https://nerd-notes.com/ubq/119428/"
date_modified: "2026-08-19T12:40:17+00:00"
---

# A student plans to separate an equimolar liquid mixture of ethanol, \(\text{C}_2\text{H}_5\text{OH}\), and water, \(\text{H}_2\text{O}\), by fractional distillation at \(1\text{ atm}\).

| Component | Normal boiling point |
|———–|———————-|
| \(\text{C}_2\text{H}_5\text{OH}\) | \(78^\circ\text{C}\) |
| \(\text{H}_2\text{O}\) | \(100^\circ\text{C}\) |

The apparatus includes an electrically heated distillation flask, a packed fractionating column, a thermometer, a water-cooled condenser, and a receiving flask. Which proposed setup, operating procedure, and prediction will best produce an ethanol-enriched initial distillate while correctly monitoring the vapor temperature?

A student plans to separate an equimolar liquid mixture of ethanol, \(\text{C}_2\text{H}_5\text{OH}\), and water, \(\text{H}_2\text{O}\), by fractional distillation at \(1\text{ atm}\).

| Component | Normal boiling point |
|-----------|----------------------|
| \(\text{C}_2\text{H}_5\text{OH}\) | \(78^\circ\text{C}\) |
| \(\text{H}_2\text{O}\) | \(100^\circ\text{C}\) |

The apparatus includes an electrically heated distillation flask, a packed fractionating column, a thermometer, a water-cooled condenser, and a receiving flask. Which proposed setup, operating procedure, and prediction will best produce an ethanol-enriched initial distillate while correctly monitoring the vapor temperature?

- **A.** Use the packed column, submerge the thermometer bulb in the boiling mixture, heat slowly, and collect the initial fraction separately; predict \(0.50<x_{\text{ethanol}}<1.00\).
- **B.** Use the packed column, center the thermometer bulb at the entrance to the condenser, heat rapidly, and collect the initial fraction separately; predict \(0.50<x_{\text{ethanol}}<1.00\).
- **C.** Use the packed column, center the thermometer bulb at the entrance to the condenser, heat slowly, and collect the initial fraction separately; predict \(x_{\text{ethanol}}=1.00\).
- **D.** Use the packed column, center the thermometer bulb at the entrance to the condenser, heat slowly, and collect the initial fraction separately; predict \(0.50<x_{\text{ethanol}}<1.00\).

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/119428/*