Question

By analogy with phosphorus compounds, name the following: \(\mathrm{Na}_{3} \mathrm{AsO}_{4}, \mathrm{H}_{3} \mathrm{AsO}_{4}, \mathrm{Mg}_{3}\left(\mathrm{SbO}_{4}\right)_{2}\)

Short answer

Compound 1: Sodium arsenate, Compound 2: Orthoarsenic acid, and Compound 3: Magnesium orthoantimonate.

Step-by-step solution

Compound 1: Na₃AsO₄

This compound's structure is analogous to sodium phosphate (Na₃PO₄). Therefore, we replace the phosphorus with arsenic and call it sodium arsenate.

Compound 2: H₃AsO₄

This arsenic compound is analogous to phosphoric acid (H₃PO₄). Therefore, to name it, we replace the phosphorus with arsenic and call it arsenic acid or more specifically, orthoarsenic acid.

Compound 3: Mg₃(SbO₄)₂

This compound has a structure similar to magnesium phosphate (Mg₃(PO₄)₂). Therefore, we replace the phosphorus with antimony and call it magnesium orthoantimonate.