I’m at the stage with black powder, recovered by displacement with Zn. I’m thinking I need to continue to wash with hot H2O, but I’ve reached “igniting in a muffle furnace”
I believe that this powder contains a few percent rhodium. Hoke says this step is not absolutely necessary, but I would like to isolate rhodium if present: Hoke says that this converts the iridium to a powder that won’t easily dissolve, but is that also the case with rhodium here?
Or, is the ignition step mainly for iridium, as she stated? Basically, will the subsequent, dilute aqua regia treatment leave behind the rhodium as insoluble powder, if I don’t ignite it prior in a muffle furnace?
I believe that this powder contains a few percent rhodium. Hoke says this step is not absolutely necessary, but I would like to isolate rhodium if present: Hoke says that this converts the iridium to a powder that won’t easily dissolve, but is that also the case with rhodium here?
Or, is the ignition step mainly for iridium, as she stated? Basically, will the subsequent, dilute aqua regia treatment leave behind the rhodium as insoluble powder, if I don’t ignite it prior in a muffle furnace?