1. Monohydrogen Phosphate Ion (HPO₄²⁻): This is a common name used in chemistry. The aqueous solution of this ion is often simply called "hydrogen phosphate solution" or "dihydrogen phosphate solution."
2. Sodium Hydrogen Phosphate (Na₂HPO₄): This is a specific salt of the monohydrogen phosphate ion. It is also known as disodium hydrogen phosphate. Its aqueous solution is often called "sodium phosphate solution" or "disodium phosphate solution."
3. Potassium Hydrogen Phosphate (KH₂PO₄): This is another specific salt of the monohydrogen phosphate ion. It is also known as monopotassium phosphate. Its aqueous solution is often called "potassium phosphate solution" or "monopotassium phosphate solution."
4. Ammonium Hydrogen Phosphate ((NH₄)₂HPO₄): This is yet another specific salt of the monohydrogen phosphate ion. It is also known as diammonium hydrogen phosphate. Its aqueous solution is often called "ammonium phosphate solution" or "diammonium phosphate solution."
Therefore, depending on the context, "aqueous hydrogen phosphate" could refer to several different compounds. It's essential to have more information to know which specific compound is being discussed.
