Acid Naming and IUPAC Nomenclature

What is the IUPAC name for H3PO₃ as an acid?

1) Phosphorous acid

2) Hydrophosphoric acid

3) Hydrophosphorous acid

4) Phosphoric acid

5) Hypophosphorous acid

Final answer:

The IUPAC name for H3PO₃ as an acid is phosphorous acid.

The IUPAC name for H3PO₃ as an acid is phosphorous acid. It is important to note that H3PO₃ is often referred to using its common name, phosphoric acid. However, according to IUPAC nomenclature, the correct name for this compound is phosphorous acid. This is because the prefix 'phospho-' is used for compounds with a higher oxidation state of phosphorus.

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