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Dipotassium phosphate (K2HPO4) - also phosphoric acid, dipotassium salt; dipotassium hydrogen orthophosphate; potassium phosphate, dibasic - is a highly water-soluble salt which is often used as a fertilizer, food additive and buffering agent. It is a common source of phosphorus and potassium.
The pH of a dipotassium phosphate solution is almost neutral. It is formed by the stoichiometric neutralization of phosphoric acid with potassium hydroxide:
H3PO4 + 2 KOH → K2HPO4 + 2 H2O
It reacts with phosphoric acid to generate monopotassium phosphate:
K2HPO4 + H3PO4 → 2 KH2PO4
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