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topic 12124

Copper Sulfate solubility


 

Does anyone know how many grams of copper sulfate [linked by editor to product info at 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" [link is to info about book at Amazon], 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



 

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 deg. 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 Teds signature
Ted Mooney, P.E. RET
finishing.com
Pine Beach, New Jersey


February 25, 2009

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

camelia riscanu
chemist - Romania


January 30, 2011

The values that you get from CRC or other sources (e.g. 32 grams copper sulfate 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



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