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-----copper sulphate solubility
Does anyone know how many grams of copper sulphate ⇦ on eBay or Amazon [affil link] (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 affil links] , 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
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, P.E.
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copper sulphate is soluble in mixture 1:1 of dichlormethane and ethanol?
camelia riscanuchemist - 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
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