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



-----

copper sulphate solubility



 

Does anyone know how many grams of copper sulphate [on eBay or Amazon] (CuSO4) goes into 100 mL of water, at room temperature to make a "supersaturated" solution?

Tim O'Brien
- Murphy, Texas



Sure, Tim! We know that! And so do you!

I mean, it's in your CRC Handbook of Chemistry & Physics [adv: on Amazon & AbeBooks & eBay] , which is likely in your high school, college, town, or personal library. 14.3 grams in cold water, 75.4 in hot. What temperature's your room?

lee gearhart
Lee Gearhart
metallurgist - E. Aurora, New York
 


Hi, Tim.
On webpage ipmwww.ncsu.edu/agchem/chptr10/1007.PDF, I found the solubility of CuS04.5H20 to be 267 pounds per 100 gallons at 32 deg. F.
At www.cdms.net/ldat/mp50R001.pdf, I found it to be 31.6 g/100 cc at 0 °C. You could do the calculation to see if these two sources agree.
At www.uiwtx.edu/~mackinno/alicefiedler/solubility.htm, I saw tables for different temperatures and a graph. It shouldn't take much effort to review these pages and find similar ones so that you can complete your calculation if you understand the principles. Good luck.

Ted Mooney, finishing.com
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
 

copper sulphate is soluble in mixture 1:1 of dichlormethane and ethanol?

camelia riscanu
chemist - Romania
February 25, 2009


The values that you get from CRC or other sources (e.g. 32 grams copper sulphate pentahydrate at 20° C) are for a "saturated" solution, you cannot dissolve more for a "supersaturated" solution except by this one trick. Dissolve a larger amount at higher temperature (e.g. 50 g at 60° C), make sure all is dissolved, then cool down. If you are lucky, and have a clean container, the excess will not precipitate out and you will end up with a supersaturated solution.

Daniel Evans
- Los Angeles, California
January 30, 2011




(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"