Simplify the following text for a Grade 9 native English-speaking person.
Original: Hypophosphorous acid is a phosphorus oxoacid and a powerful reducing agent with molecular formula H3PO2 . Inorganic chemists refer to the free acid by this name ( also as `` HPA '' ) , or the acceptable name of phosphinic acid .
Simplified: Hypophosphorous acid , also known as phosphinic acid , is a chemical compound .