What is the chemical formula for magnesium ammonium phosphate?

The chemical formula for magnesium ammonium phosphate is accurately represented as NH₄MgPO₄. This notation indicates that the compound is made up of one ammonium ion (NH₄⁺) and one magnesium phosphate (MgPO₄²⁻). The presence of ammonium in the formula highlights the relationship between magnesium and phosphate in the context of wastewater treatment, as this compound plays a significant role in the precipitation process used to remove excess phosphorus.

Understanding the correct arrangement of elements in a chemical formula is crucial, particularly in this case, as it reveals the interactions and composition of the compound. The formula serves to illustrate the stoichiometry of the ions involved, ensuring the balance of charges and providing insight into the structural attributes of the compound.

The other options, while representative of various combinations of magnesium, ammonium, and phosphate ions, do not accurately capture the correct stoichiometry or arrangement that defines magnesium ammonium phosphate. The presence of multiple phosphate groups or different arrangements of ions would lead to different compounds, which is why they do not correctly represent magnesium ammonium phosphate.