Chapter 8.3, Problem 55SSC

Interpretation Introduction

Interpretation:

The Lewis structure of ${\text{CN}}^{-},{\text{SiF}}_{\text{4}},{\text{HCO}}_{\text{3}}{}^{-}{\text{andAsF}}_{\text{6}}{}^{-}$ needs to be drawn.

Concept introduction:

Lewis structure is a model which uses electron-dot structures to show how electrons are arranged in molecules.

Answer to Problem 55SSC

Lewis structure of ${\text{CN}}^{-}$ molecule is as follows:

Lewis structure of ${\text{SiF}}_{\text{4}}$ molecule is as follows:

Lewis structure of ${\text{HCO}}_{\text{3}}{}^{-}$ molecule is as follows:

Lewis structure of ${\text{AsF}}_{\text{6}}{}^{-}$ molecule is as follows:

Explanation of Solution

Triple bonds are present between carbon and nitrogen atom in the structure of ${\text{CN}}^{-}$. Lewis structure of ${\text{CN}}^{-}$ molecule is as follows:

In the structure ${\text{SiF}}_{\text{4}}$ four F atom attached to Si atom with single bond. Lewis structure of ${\text{SiF}}_{\text{4}}$ molecule is as follows:

In the structure of ${\text{HCO}}_{\text{3}}{}^{-}$ three O atoms attached to C atom with single bond and one hydrogen atom is attached to O atom. Lewis structure of ${\text{HCO}}_{\text{3}}{}^{-}$ molecule is as follows:

In the structure of ${\text{HCO}}_{\text{3}}{}^{-}$ six F atoms are attached to As atom with single bond. Lewis structure of ${\text{AsF}}_{\text{6}}{}^{-}$ molecule is as follows:

Conclusion

Molecules that can donate electrons are Lewis base and the molecules that can accept electrons are Lewis acid.