What is K2HPO4? Important knowledge about K2HPO4.

Definition of K₂HPO₄
K₂HPO₄ is a chemical notation for a substance also known as Hydrogen Diphosphate Potassium or Dihydrogen Potassium Phosphate. In English, this substance is often referred to as Dipotassium Hydrogen Phosphate. K₂HPO₄ has a molar mass of 174.18 g/mol. The molecular structure of K₂HPO₄ includes 2 potassium atoms (K), one hydrogen atom (H) and one phosphate group (PO₄). In addition, this compound also contains K+ ion and HPO₄^2- ion.

Properties of K₂HPO₄

• Physical properties:
  K₂HPO₄ is a solid substance, white or colorless, and odorless. In its solid form, K₂HPO₄ has a pH range from 8.0 to 9.0.
• Chemical properties:
  K₂HPO₄ is soluble in water and has a weak basic property. When dissolved in water, it forms a neutral pH solution.

Common chemical equations involving K₂HPO₄
K₂HPO₄ often participates in reactions with acids to produce CO₂ gas. For example, some reaction equations of K₂HPO₄ with acids are:
K₂HPO₄ + H₂SO₄ -> K₂SO₄ + H₃PO₄
K₂HPO₄ + 2HCl -> 2KCl + H₃PO₄

Synthesis of K₂HPO₄

• Laboratory synthesis:
  K₂HPO₄ is typically synthesized from the reaction between Hydrogen Phosphate (KH₂PO₄) and Potassium Hydroxide (KOH).
  KH₂PO₄ + KOH -> K₂HPO₄ + H₂O
• Industrial synthesis:
  In industry, K₂HPO₄ is usually produced by the reaction between Monopotassium Phosphate (KH₂PO₄) and Potassium Carbonate (K₂CO₃).
  2KH₂PO₄ + K₂CO₃ -> 2K₂HPO₄ + CO₂ + H₂O