finishing.com -- The Home Page of the Finishing Industry
A website for Serious Education, promoting Aloha,
& the most FUN smiley you can have in metal finishing

HomeFAQsBooksHelpWantedAdvertiseForum
(current
topics)
topic 11416

Gold did not precipitate as anticipated :)


 

Sulfurous acid is known to destroy the excess nitric acid and eventually precipitate gold from the gold-aqua regia solution. I tried adding an excess of 5-6% of its AR grade. After a while brown clouds appear and get denser. However, it also easily disaappeared as the solution warms up. The solution's color turned from reddish orange to a much lighter yellow orange. What could possibly be wrong that the gold did not precipitate? Should I use another reducing agent?

Tim Carino
- Philippines



This public forum has 60,000 threads. If you have a question in mind which seems off topic to this thread, you might prefer to Search the Site

ADD a Q or A to THIS thread START a NEW THREADView CURRENT TOPICS

Disclaimer: It's not possible to diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations may be deliberately harmful.

  If you need a product/service, please check these Directories:

JobshopsCapital Equip. & Install'nChemicals & Consumables Consult'g, Train'g, SoftwareEnvironmental ComplianceTesting Svcs. & Devices


©1995-2017 finishing.com     -    Privacy Policy
How Google uses data when you visit this site.