Detailed Product Description:
A white to yellowish crystalline powder.  Extremely hygroscopic.
Phosphorous acid is used in chemical reactions as a reducing agent
that is less vigorous than the related hypophosphorous acid.   
 
Grade/Purity:
This is Reagent Grade material with a minimum purity of 99%.
 
Background:
Phosphorous acid, is one of the oxoacids of phosphorus that includes
the other important members of this family; phosphoric acid, H3PO4,
and hypophosphorous acid, H3PO2.  Note that only the reduced
phosphorus compounds are spelled with an "ous" ending.  
Other names for this acid are orthophosphorous acid and
dihydroxyphosphine oxide.
 
Precautions:
Read and understand all precautions stated in Material Safety Data
Sheet (MSDS, downloadable below).  Strong irritant to eyes and skin.
Toxic by inhalation and ingestion.
 
Click here to download a copy of MSDS (Material Safety Data Sheet).
 
Packaging:
Contents of 200 grams comes packed in 250 ml wide mouthed amber
glass bottle.