Please excuse the following act of self indulgence, this is exactly what we discussed in chemistry today.
The cloudiness you see is a chemical reaction where a precipitate is forming. In fact without the cloudiness a precipitate is not forming. The following reaction is considered a single replacement reaction since the iron cation replaces the potassium cation and bonds with the PO4 anion. I am not sure what happens to the KH2 molecule.
KH2 Potassium dihydrogen
PO4 Phosphate ion
The KH2PO4 molecule disassociates into KH2(aq) and PO4(aq). The iron then combines with the phosphate ion and forms FePO4(s). AKA-KH2PO4-> KH2(aq) + PO4(aq) + Fe -> KH2(aq) + FePO4(s).
Sorry I cannot balance the equation, I do not know what happens to KH2.
Does it disassociate into K + H2?
Am I even close, please let me know (I have a test on this material this Friday).