/*! This file is auto-generated */ .wp-block-button__link{color:#fff;background-color:#32373c;border-radius:9999px;box-shadow:none;text-decoration:none;padding:calc(.667em + 2px) calc(1.333em + 2px);font-size:1.125em}.wp-block-file__button{background:#32373c;color:#fff;text-decoration:none} Q26P (a) How can you improve the reso... [FREE SOLUTION] | 91影视

91影视

Log out

Learning Materials

Features

Discover

Chapter 24: Q26P (page 664)

(a) How can you improve the resolution between two closely spaced peaks in gas chromatography?

(b) What approach from (a) would be most cost effective (not involve a purchase)?

Short Answer

Expert verified

(a). In gas chromatography, to show how to improve the resolution between two closely spaced peaks.

(b). Optimizing the flow rate and temperature in gas chromatography is the most effective way to improve the resolution between the two closely spaced peaks.

Step by step solution

01

Definition of chromatography 

As a result of differential distribution of the solutes as they flow over or over a stationary liquid or solid phase, a chemical mixture transported by a liquid or gas is split into components.

02

Determine the resolution between two closely spaced peaks in gas chromatography  

(a)

  • It is necessary to discuss how to improve the resolution between two closely spaced peaks in gas chromatography.
  • In gas chromatography, to show how to improve the resolution between two closely spaced peaks.
  • In gas chromatography, there are several approaches to increase the resolution between two closely spaced peaks:
  • Increase the column's length while decreasing its diameter.
  • By altering the stationary phase of the system.
  • By maximising the pace of flow.
  • Increase the retention factor by increasing the thickness of the film as the temperature drops.
03

Determine in what approach from (a) would be most cost effective (not involve a purchase)

(b)

  • It is necessary to take the most cost-effective technique.
  • To provide the most cost-effective solution
  • Optimizing the flow rate and temperature in gas chromatography is the most effective way to improve the resolution between the two closely spaced peaks.

Unlock Step-by-Step Solutions & Ace Your Exams!

  • Full Textbook Solutions

    Get detailed explanations and key concepts

  • Unlimited Al creation

    Al flashcards, explanations, exams and more...

  • Ads-free access

    To over 500 millions flashcards

  • Money-back guarantee

    We refund you if you fail your exam.

Over 30 million students worldwide already upgrade their learning with 91影视!

One App. One Place for Learning.

All the tools & learning materials you need for study success - in one app.

Get started for free

Most popular questions from this chapter

Astandard solution containing 6.3脳10-8Miodoacetone and 2.0脳10-7Mp-dichlorobenzene (an internal standard) gave peak areas of 395 and 787, respectively, in a gas chromatogram. A 3.00-mlunknown solution of iodoacetone was treated with 0.100mLof 1.6脳10-5Mp-dichlorobenzene and the mixture was diluted to. Gas chromatography gave peak areas of 633 and 520 for iodoacetone and p-dichlorobenzene, respectively. Find the concentration of iodoacetone in the 3.00mLof original unknown.

Consider the chromatography of n-c12H26on a 25 m 脳 0.53 mm open tubular column of 5% phenyl鈥�95% methyl polysiloxane with a stationary phase thickness of 3.0 渭尘and He carrier gas at 125潞C. The observed retention factor for n-c12H26is 8.0. Measurements were made of plate height, H, at various values of linear velocity,渭xm/s. A least-squares curve through the data points is given by

localid="1654864230381" H(m)=(6.0脳10-5m2/s)/渭x+(2.09脳10-3s)渭xthecoefficientsofthevanDeemterequation,findthediffusioncoefficientofn-c12H26inthemobileandstationaryphases.Whyisoneofthesediffusioncoefficientssomuchgreaterthantheother?

(a) Use Trouton's rule, 鈭�Hvap掳鈮�(88Jmol-1K-1)Tbp, to estimate the enthalpy of vaporization of octane (b.p. 126掳).

(b) Use the form of the Clausius-Clapeyron equation below to estimate the vapor pressure of octane at the column temperature in Figure 24-9(70掳C)

In(P1P2)=-(鈭�HvapR)(1T1-1T2)

(c) Calculate the vapor pressure for hexane (b.p. 69掳C) at70掳C

(d) What is the relationship between solute vapor pressure and retention?

(e) Why is the technique called "gas chromatography鈥� if retained analytes are only partially vaporized?

3. (a) What are the advantages and disadvantages of using a narrower open tubular column?

(b) What are the advantages and disadvantages of using a longer open tubular column?

(c) What are the advantages and disadvantages of using a thicker film of stationary phase?

(a) When a solution containing234mg of pentanol (FM 88.15) and237mg of 2,3 -dimethyl-2-butanol (FM 102.17) in10.0ml was separated, relative peak areas were pentanol: 2,3 -dimethyl-2-butanol = 0.913 : 1.00. Considering pentanol to be the internal standard, find the response factor for 2,3 -dimethyl-2-butanol.

(b) Use Equation 24-8 to find the areas for pentanol and 2,3 -dimethyl-2-butanol in Figure 24-8.

(c) The concentration of pentanol internal standard in the unknown solution was93.7mM . What was the concentration of 2,3 -dimethyl2-butanol?
See all solutions

Recommended explanations on Chemistry Textbooks

Kinetics

Read Explanation

Organic Chemistry

Read Explanation

Nuclear Chemistry

Read Explanation

Chemical Analysis

Read Explanation

Ionic and Molecular Compounds

Read Explanation

Making Measurements

Read Explanation
View all explanations

What do you think about this solution?

We value your feedback to improve our textbook solutions.

Study anywhere. Anytime. Across all devices.