Assertion: hypophosphorous acid's concentration | /r/HasProperty | 1 to 500 ppm
Facets:
value: by mass
type: OTHER
Source sentences:
text: When preparing the aqueous solution containing the hypophosphite compound, the water-soluble calcium is used so that the concentration of calcium is 1 to 500 ppm by mass, preferably 5 to 300 ppm by mass, more preferably 20 to 100 ppm by mass.