Basicity of `H_(3)PO_(4)` and `H_(3)PO_(3)` is 3 and 3 RESPECTIVELY ACIDITY of `H_(3)PO_(4)` and `H_(3)PO_(3)` is 3 and 3 respectively Acidity of `H_(3)PO_(4)` and `H_(3)PO_(3)` is 3 and 2 respectively Basicity of `H_(3)PO_(4)` and `H_(3)PO_(3)` is 3 and 2 respectively