Phosphoric acid is classified as weak acid as Phosphoric acid undergoes partial dissociation in water solution as it does not fully dissociate into H+ (H3O+) and the dihydrogen phosphate ion when dissolved in water and producing a low concentration of hydrogen ions . So, Phosphoric acid is a weak acid .

Phosphoric acid chemical formula is H ₃PO ₄. Orthophosphoric acid refers to phosphoric acid

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Used as a Pre-Metal Treatment Chemicals
Sugar Refining
Anodising
Very Good Stabilising Agent for Hydrogen Peroxide
Waste Water Treatment Chemicals
Activated Carbon
Soaps and Detergents
Tea-leaf Processing