.......dissolved FeSO4 (farmhouse supply grade
), dumped in 1/2 eq. sulfuric acid, a 1/2 molar eq. H2O2 - the mixtr will still bee milky, but that don't matter - it's just that Fe
2(SO
4)
3 is very prone to hydrolysis and partially dissociates into Fe(OH)
3 and HSO4
-.
This can bee reacted w/an equimolar qtty of CaCl
2 - take a note that if you do it at like 90 C, the formed CaSO
4 will bee in its 'anhydrite' form - i.e., doesn't suck up the water and is much easier to filter.
Evap the water, preferrably under vacuum. I dunno if the hydrate can bee dried under ordinary excicator conditions, but converting it into unhydrous salt is quite tricky, it hydrolyses on heating. OTOH, CuCl2 is also said to bee susceptible to that, but the practice shows that it dehydrates fairly easily under a heat of an ordinary lamp - although some decomposition still ocurs.
Antoncho