Chapter 16, Problem 182AP

(a) Use VSEPR to predict the geometry of the hydronium ion $\left({\text{H}}_{\text{3}}{\text{O}}^{+}\right)$. (b) The O atom in ${\text{H}}_{\text{2}}\text{O}$ has two lone pairs and in principle can accept two ${\text{H}}^{\text{-}}$ ions. Explain why the species ${\text{H}}_{\text{4}}{\text{O}}^{\text{2-}}$ does not exist. What would be its geometry if it did exist?