Chemical Forums

Chemistry Forums for Students => High School Chemistry Forum => Topic started by: bbrotherbill on August 29, 2004, 03:01:20 PM

Title: sugar...salt
Post by: bbrotherbill on August 29, 2004, 03:01:20 PM

I have mixed them together.... HELP !!!!! I need to seperate them back out again.... how can I do it?

Title: Re:sugar...salt
Post by: budullewraagh on August 29, 2004, 03:11:54 PM

AHHHHHHHHHHHHHHHHHH!!!!!!!!!!!!!!! ;D

just so i know how to advise you, is it alright if you change the sugar and/or salt to other compounds?

Title: Re:sugar...salt
Post by: Limpet Chicken on August 29, 2004, 03:24:50 PM

Now now, let's not bee TOO suspicious of people;D

PM me and I'll see what I can find 8)

Title: Re:sugar...salt
Post by: Donaldson Tan on December 22, 2004, 12:30:01 PM

sugar and salt.. do both of them dissolve in ethanol?

Title: Re:sugar...salt
Post by: jdurg on December 22, 2004, 12:57:41 PM

Sugar and salt have two VASTLY different solubilities in water.  At 20 degrees Celcius, 203.9 grams of sugar will dissolve in 100 grams of water, while only 35.9 grams of NaCl will dissolve in 100 grams of water.  So if you were to slowly evaporate the solution, the NaCl will ppt out MUCH sooner than the sugar will as the amount of water dissipates.  With both of these solutes, their solubility increases as you heat up the water, so you could also heat the solution along to increase the solubility and remove the water quicker.  As it cools, the NaCl will ppt out.  Then you can just filter the solution and the filtrate will contain the sugar.  Just repeat this process a large number of times, and you'll eventually separate the two solutes.