Lou said:Sir, I refer you to your own thread.
http://goldrefiningforum.com/phpBB3/viewtopic.php?f=60&t=12705
If you think quoting the SRPs somehow makes you one iota of right about chlorine practically being a reducing agent for gold (III) in aqueous environments, you need re-educated.
By your logic you could never leave a solution of gold (III) in HCl, because Au(III) would be oxidizing chloride to chlorine. By your logic, it's impossible to dissolve gold with chlorine and 1M hydrochloric acid at 25*C. By your logic, it's impossible to make anhydrous gold (III) chloride. Chloride isn't an oxidant anyway.
Chlorine doesn't ever practically reduce gold by cementation. The only time chlorine is being oxidized by gold in my experience chlorinating A LOT of gold is electron transfer due to thermal disproportionation at higher temperatures. Not that the standard reduction table means a damn thing with temperature swings, since it's merely a cute table compiled for convenient access of thermodynamics information.
I'm done using SO2 though, I'll just use LCl2 now since I have my pick.
In theory there is no difference between theory and practice, but in practice there is.
Did you not read that I stated that after the gold deposits upon the anode that it redissolves and eventually ends up totally upon the cathode? This was just an example of the physics involved. Gold chloride reduced by chlorine gas is redissolved by the chlorine immediately after it's deposition upon the cathode. The point was to look at the nature of gold in thionate solutions. If you use an anode bag, you will catch the flakes as they fall off. At voltages below 0.85 they won't even fall off at all. Neither on a steel anode unless the amperage is too high. If you must comment about my statements, have the courtesy to pay attention to the total posts. Furthermore, a solution of gold chloride/HCl treated with NaOCl in the sun light, will precipitate golden triangles that will last only a few seconds before redissolving. The 'glitter' produced is unforgettable. It cannot be repeated with the same solution. As a chemist, you should know the interaction of chlorine with hydrogen in ultraviolet light. Now, please leave me to my need to help newbies. You are a chemist, If you want to know more, do the experiments yourself. Dr. Poe