From the previous equations, a molar mass balance on the phosphate radical may be performed. Let spP(FeIII represent the species in solution containing P04 species, using a ferric salt as the precipitant. (Note the Felll as the second subscript, indicating that a ferric salt is used.) Therefore,
[ sp po4Feiii ] = [ P04-] + [ HPO^l + [ H2PO-] + [ H3PO4 ] (36)
To indicate the removal of phosphate using the ferric salt, we use the following precipitation reaction to incorporate the iron into the above equation:
FeP04i ^ Fe3+ + P°3- KspFeP( = 10-219 at 25 ° C (37)
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