Dihydrogen phosphate

 ( Anions ) 

Dihydrogen phosphate is an inorganic ions with the formula H₂PO₄⁻. Phosphates occur widely in natural systems. Perhaps the most common salt of dihydrogen phosphate is sodium dihydrogen phosphate. It is used in animal feed, fertilizer, buffer solution (in food), and treating metal surfaces.

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Structure The dihydrogen phosphate anion consists of a central phosphorus atom bonded two oxides and two in a tetrahedron arrangement.

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Acid-base equilibria Dihydrogen phosphate can be both a hydrogen donor and acceptor.

H3PO4 + H+	p Ka1 = 2.14
+ H+	p Ka2 = 7.20
+ H+	p Ka3 = 12.37

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Examples

• Ammonium dihydrogen phosphate ((NH₄)(H₂PO₄))
• Monocalcium phosphate (Ca(H₂PO₄)₂)

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Safety Many foods including milk, eggs, poultry, and nuts contain these sodium phosphates.

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Notes

Categories: Anions, Phosphates

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