   Chapter 20, Problem 42PS

Chapter
Section
Textbook Problem

The refrigerating liquids in air conditioners and refrigerators are largely chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs). Among the latter family of compounds is the refrigerant HCFC-22 (HCClF2). A problem with the use of HCFC-22 is that HFC-23 (trifluoromethane, HCF3), a gas with high-global-warming potential, is a by-product of its production (and also from the production of the widely used polymer Teflon). Discarding HFC-23 safely can be a problem. However, recently a method has been developed to convert it to the valuable catalyst trifluoromethane-sulfonic acid, CF3SO3H. Draw an electron dot structure for the acid (which you can think of as sulfuric acid with a CF) group in place of one OH group). Indicate the geometry around the C and S atoms. What is the hybridization of these two atoms?

Interpretation Introduction

Interpretation: The Lewis electron dot structures for tri fluoromethane sulfonic acid and the geometry around the carbon and Sulphur atom should be given.

Concept introduction:

Lewis dot structure: For a given molecule, the bonding concerning the atoms and also the lone pairs can be shown by the diagram.

In this structure a single bond is represented by one dot pair and double bond is represented by two dot pairs and so on.

VSEPR Theory [Valence Shell Electron Pair Repulsion Theory]:

Geometry of the molecules can be predicted using VSEPR Theory. It is based on the number of electron pairs around the central atom of the molecule. Depending upon the bond pairs and lone pairs, geometries can be classified as linear, bent, pyramidal, trigonal planar, tetrahedral, octahedral and so on.

Explanation

In a molecule, Lewis structure shows the position of an atom and bonding is represented by lines or dot pairs.

The Lewis structure for trifluoromethane sulfonic acid is shown below.

Geometry around atoms in the given molecule can be predicted by VSEPR Theory.

In trifluoromethane sulfonic acid , the carbon atoms are surrounded by four bond pairs. Therefore, the geometry will be tetrahedral and the bond angle will be 109.5°

Hybridization is defined as the intermixing of atomic orbitals of atoms to form hybrid orbitals of same energy

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