PCl3 + H2O  H3PO3 + 3HCl
It is a weak electrolyte used as rust remover.
The molarity of the buffer and the hydrogen concentration of the buffer.
Hydrogen chloride: R-OH+PCl3=R-Cl+H3PO3+HCl
The concentration.
H3po3
because H3PO3 has 2 acidic hydrogen and its basicity is 2.
The chemical formula for phosphonic acid is H3PO3.
Pcl3 + 3h2o-------> h3po3 + 3 hcl
Phosphorus acid
1
H3PO3 is phosphorous acid or orthophosphorous acid. It is a colorless or yellowish solid with a garlic like taste. It is an unstable compound that readily absorbs moisture and converts to phosphoric acid (H3PO4).
Formula: H3PO3
For example: H3PO3
PCl3 + H2O  H3PO3 + 3HCl
becouse it doesn't produce more hydrogen ions
H₃PO₃ is the molecular formula for Phosphorus Acid.Hope this helps.