Fig. 5. Representative scanning electron microscope image of precipitates after 60 min of reaction time for the 0.1 M [Cl^–] treatment and corresponding energy dispersive X-ray spectra shown below. Reactions contained 9.1 mM Cu(II) and Fe(II) and were performed at pH 5.2 ± 0.2 in water. Scale bar equals 2 µm.