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Topic: separation of mixtures  (Read 6138 times)

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Offline cvn

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separation of mixtures
« on: January 15, 2007, 01:30:34 AM »
Hi guys..

I have have a problem.


In my beaker,it contains a mixture...  :-\

The mixture consist of:Iodine solid(I2),Iron filling, Copper(II) sulphate and salt.

How do i separate them if i have to get them all back as pure substance?


Thanks in advance  ;D
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Offline Mitch

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Re: separation of mixtures
« Reply #1 on: January 15, 2007, 01:43:31 AM »
You have to show you've attempted the problem. http://www.chemicalforums.com/index.php?page=forumrules
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Offline cvn

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Re: separation of mixtures
« Reply #2 on: January 15, 2007, 01:46:22 AM »
yes i've already attempted it..  ;)

i tried using a magnet to attract all the iron fillings out. Now iron fillings was separated. Next ive 3 solids left. If i dissolve them in water, they will be soluble. I can't continue from here now =\

Unless using a magnifying glass to slowly separate the solids by their color. Any other way or is this the correct way?
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Offline Mitch

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Re: separation of mixtures
« Reply #3 on: January 15, 2007, 02:17:30 AM »
I2 sublimes with a little heat.
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Offline cvn

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Re: separation of mixtures
« Reply #4 on: January 15, 2007, 02:48:24 AM »
ah okay.

so i'll warm the mixture awhile. then using a condenser to condense it on another beaker.

but what about table salt and copper (II) sulphate?  :-\
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Offline cvn

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Re: separation of mixtures
« Reply #5 on: January 15, 2007, 02:59:22 AM »
Okay, i've done some searching and found the melting pts of both salts.

Copper (II) Sulphate: ~120 °C
Sodium Chloride: ~800 °C

So i'll use heating and condensing? Now it looks really weird..
Tell me if i'm correct  :-\
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Offline billnotgatez

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Re: separation of mixtures
« Reply #6 on: January 15, 2007, 01:01:29 PM »
Some compounds breakdown when the temperature is increased.
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Offline cvn

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Re: separation of mixtures
« Reply #7 on: January 17, 2007, 11:56:01 PM »
Ohh my! So i'm kinda wrong somehow..

I think i can solve it by solubility? On how soluble the 2 salts are? Okay i'm confused now..  :-[
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Offline cvn

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Re: separation of mixtures
« Reply #8 on: January 21, 2007, 09:49:17 PM »
uhh yep copper sulphate decompose to form copper (II) oxide..

arghhh!

i heard theres this solubility rule where u can apply to solve this qns. how do i go about doing that? however if i'm given just the limited amt of salts, how am i going to solve this question?  ???
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Offline billnotgatez

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Re: separation of mixtures
« Reply #9 on: January 21, 2007, 10:08:43 PM »
You might check and see what the items are soluble in. you might want to see if acidity or basicity influences solubility.

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