No registration or passwords; no pop-up ads -- just aloha, fun, & answers.
(as an eBay Partner & Amazon Affiliate earns from qualifying purchases).
Home /
T.O.C.
Fun
FAQs
Good
Books
Ref.
Libr.
Advertise
 
Help
Wanted
Current
Q&A's
Site 🔍
Search
pub  Where the
world gathers for metal finishing
Q&As since 1989



-----

How to Break a Tin Gel




A solution of HCl containing about 6% tin as tin tetrachloride is being neutralized with caustic. When a pH of 3 is reached the solution becomes a heavy gel which at pH 7 occupies about 50% of the volume. Upon increasing the pH to 12-14 the gel dissolves and upon re-neutralizing to pH 7 all returns. How can this dispersion be broken? Help!

Pero Dukleski
environmental services - Valparaiso, IN, U.S.A.
2006



Stannous chloride occurs when treating tin with hydrochloric acid. It is soluble in water, but not in acid (hence, insoluble in water below pH 7, which is technically an "acid"). All you can do is keep the pH up to keep it in solution. It has many uses in industry if you make enough of it.

paul morkovsky
Paul Morkovsky
- Shiner, Texas, USA
2006




(No "dead threads" here! If this page isn't currently on the Hotline your Q, A, or Comment will restore it)

Q, A, or Comment on THIS thread -or- Start a NEW Thread

Disclaimer: It's not possible to fully 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 might be harmful.

If you are seeking a product or service related to metal finishing, please check these Directories:

 
Jobshops
Capital
Equipment
Chemicals &
Consumables
Consult'g, Train'g
& Software


About/Contact  -  Privacy Policy  -  ©1995-2024 finishing.com, Pine Beach, New Jersey, USA  -  about "affil links"