Question

Match each of the following ions with its correct molecular geometry. Items (3 items) (Dragand drop into the appropriate area below) CPO- PS3³- SiO3²- Categories Trigonal planar Linear Trigonal pyramidal

__________ __________ __________

Answer 1

The molecular geometries of the ions CPO-, PS3³-, and SiO3²- are trigonal pyramidal, trigonal planar, and linear, respectively.

Step-by-step explanation:

The molecular geometries of the following ions are as follows:

CPO- - Trigonal pyramidal

1. PS3³- - Trigonal planar
2. SiO3²- - Linear

These molecular geometries are determined by the arrangement of electron pairs around the central atom. For example, CPO- has three bonding pairs and one lone pair of electrons, resulting in a trigonal pyramidal molecular geometry. PS3³- has three bonding pairs and one lone pair of electrons, resulting in a trigonal planar molecular geometry. SiO3²- has three bonding pairs and no lone pairs, resulting in a linear molecular geometry.

Answer 2

Each ion is matched to its molecular geometry by considering the number of electron pairs around the central atom. C2O42- displays tetrahedral, PS33- has trigonal pyramidal, and SiO32- is trigonal planar molecular geometries.

Step-by-step explanation:

To match the ions with their correct molecular geometry, one must look at the number of electron pairs, including both bonding pairs and lone pairs, around the central atom. This is dictated by the VSEPR theory:

C2O42- (Oxalate ion): This ion has a central carbon atom with two oxygen atoms double-bonded and two oxygens single-bonded, creating a total of four regions of electron density. This results in a tetrahedral electron-pair geometry, but since there are no lone pairs on the carbon atom, the molecular structure is also tetrahedral.

PS33- (Phosphite ion): This ion has four regions of electron density around the central phosphorus atom (three bonding pairs and one lone pair), leading to a tetrahedral electron-pair geometry, but with the lone pair, the molecular structure becomes trigonal pyramidal.

SiO32- (Silicate ion): With three oxygen atoms bonded to the central silicon and no lone pairs, this ion has three regions of electron density, resulting in a trigonal planar electron-pair geometry and molecular structure.

Therefore, the correct matches are:

C2O42-: Tetrahedral

PS33-: Trigonal Pyramidal

SiO32-: Trigonal Planar