By using the coprecipitation method to produce Fe3O4 (iron oxide), why is my supernatant clear at first but then is very dark after multiple washes?

I have been attempting to create Fe3O4 particles using the coprecipitation method using a 2:1 FeCl3:FeCl2 ratio. Today we used 0.1M FeCl3, 0.05M FeCl2 dissolved in 20 mL of water. This was stirred...

26 July 2018 8,860 6 View