Chapter 21, Problem 111GQ

Interpretation Introduction

Interpretation: To draw the structure of anion ${{\text{[Si}}_{\text{3}}{\text{O}}_{\text{9}}\text{]}}^{\text{6}-}$ and to check the planarity of the expected ring.

Concept introduction: The anion is ${{\text{[Si}}_{\text{3}}{\text{O}}_{\text{9}}\text{]}}^{\text{6}-}$ is a type of cyclosilcate (ring silicates). It has three membered ring as there are three ${{\text{[SiO}}_3\text{]}}^{2-}$ units. All three units are linked via Si-O-Si linkage. Each Si atom has sp³ hybridization and so geometry will be tetrahedral.