Orthophosphorous acid () is titrated against . Based on its specific molecular structure, how many moles of are strictly required to completely neutralize one mole of ?

Question

Orthophosphorous acid ($H_3PO_3$) is titrated against $NaOH$. Based on its specific molecular structure, how many moles of $NaOH$ are strictly required to completely neutralize one mole of $H_3PO_3$?

Prashant Kotian · Accepted Answer

Correct answer: B. Orthophosphorous acid () is a dibasic acid. Its structure contains only two ionizable P-OH bonds (and one non-ionizable P-H bond). Therefore, exactly 2 moles of are required to completely neutralize 1 mole of the acid.

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