Hey folks,
First off I just want to say that I'm loving this forum, great bunch here and very knowledgeable!
I'm making AuCl (or HAuCl4?) with the following method:
100 mg of 24k gold leaf was placed in a graduated cylinder. To this I added ~3 mL 31.45% HCl and ~1 mL 35% H2O2 (food grade). I just used those amounts and ratio off the top of my head, probably way too much acid to dissolve this much gold. To my surprise the gold leaf dissolved rapidly in about 10 mins without any heat added. Gold leaf is extremely fine so I guess it doesn't need much coaxing.
I plan to add 50ml distilled water to this and boil it down a few times to remove the excess HCl. The question is, should I keep adding measured amounts of gold leaf until the HCl/H2O2 solution stops eating it up before adding water and boiling it down or can I just use the salts obtained after removing most of the acid to make a 1% solution? I'm just worried about excess HCl in the final product. It will just be salt once I boil out the majority of the HCl though right?
To get a 1% solution I just add 10mL of H2O to the semi dry salt. 0.1g/10mL=0.01 or 1% and 1ml of this would contain 10mg of Au.