Calcium hypophosphite

Phosphine is also made as a by-product of the commercial calcium hypophosphite [7789-79-9]. Calcium phosphite [21056-98-4] is also produced. 

Phosphorus pentachloride also reacts to yield arsenic trichloride.7 Arsenious oxide in aqueous solution is reduced by hypophosphorous acid, especially on boiling, when phosphine is liberated and brown arsenic precipitated.8 The reduction is readily brought about by calcium hypophosphite dissolved in 10 parts of hydrochloric acid (dens. 1-126), this salt being preferable in use to the sodium salt and providing an extremely sensitive reagent, although in the presence of slight traces of arsenic the brown colour may appear only after the lapse of 20 to 30 minutes.9 Arsenious oxide dissolves in arsenic trichloride to form an oxychloride.10... 

Calcium hypophosphite instead of the sodium salt may be used in the presence of hydrochloric acid,9 and the reaction may be applied for the gravimetric estimation of the element, the arsenic in the residues being redissolved and determined as magnesiumpyroarsenate,10 or by titration.11... 

Calcium Hypophosphite. CAS 7789-79-9, CalHiPOi) . white solid, snluhilily 15.4 g/100 g HiO at 2VC, formed (I) bv (toiling calcium hydroxide suspension in water and yellow phosphorus, (2) by reaction of calcium carbonate or hydroxide and hypophosphorous acid. 

Hypophosphorous acid may be prepared by digesting 150 gms. finely powdered calcium hypophosphite with 45 c.cs. of cone, sulphuric acid, and 500 c.cs. water for 1 hour at 80°, and removing the calcium sulphate by filtration. 

P. L. Dulong showed that hypophosphorous acid or its salts are formed by the decomposition of phosphides of the alkaline earths by water and H. Rose, by boiling phosphorus with milk of lime, baryta-water, or an aq. or alcoholic soln. of potassium hydroxide. The following process has been recommended—vide infra, calcium hypophosphite ... 

When wet with water a reaction occurs between the calcium hypophosphite and the lead nitrate, producing a shock-sensitive nonhygroscopic compound which incorporates both oxidizer and fuel. 

Hypophosphites and phosphates, e.g. calcium hypophosphite and glycerophosphate, are used in considerable quantities as patent medicines and in medicine generally as accessory foods. Acid phosphates are used extensively in baking powders and various manufactured foods. The phosphorus requirements of the animal body are stated on p. 4, and also the supply of the element in certain vegetable products, while the probable role of phosphates in some biological processes is indicated on p. 169. From their intimate connection with life it will be gathered that by far the most important use of phosphorus compounds is in the manufacture of fertilisers (see Chap. XV.). 

In contradistinction to phosphorus itself and the products of its slow oxidation, hypophosphorous acid and the hypophosphites do not appear to be toxic.4 Calcium hypophosphite appears to be completely eliminable from the system.5 Hypophosphites of calcium, sodium and iron have been prescribed in medicine, but although in some cases they appear to have done good there is no conclusive evidence of the value of the hypophosphite radical apart from the basic radical or other constituent of the mixture. 

Violent reaction or ignition with NH3, NH4CI, NH4+ salts, ammonium sulfate, Sb2S3, As, barium hypophosphite, BaS, calcium hypophosphite, CaS, charcoal,... 

Iron (II) Sulfate 7778-80-5 Potassium Sulfate 7789-79-9 Calcium Hypophosphite... 

Derivation Interaction of manganese sulfate and calcium hypophosphite. 

Derivation Interaction of calcium hypophosphite and potassium carbonate. 

Hypophosphlie of Iron 4642 Fe(H2F02)i Ferric hy phosphite. Hypophosohlte of lime Ca(H2F02)2 Calcium hypophosphite. 

CALCIUM HYPOPHOSPHITE (7789-79-9) Incompatible with strong acids. Shock- and heat-sensitive mixture formed with potassium chlorate may cause violent reaction or ignition. 

Calcium hypophosphite, C6H(CaOsP, asphocalcium, Cal-scetbat, Cabcorbate. 

Monobasic calcium phosphate, Ca(H2P04)2, is also known as calcium hypophosphite, calcium biphosphate, acid calcium phosphate, monocalcium orthophosphate, and primary calcium phosphate. It usually exists in the form of the hydrate Ca(H2P04)2-H20. It decomposes when heated to 2oo°C (400°F)... 

---