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Author Topic: Does freezing purify water?  (Read 19395 times)

Marco

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Does freezing purify water?
« on: 24/01/2009 23:20:52 »
Marco  asked the Naked Scientists:
   Dear NS crew,

Listening in on podcast from the Canada/US. LTS!

I very much enjoy your science news blitz and fast-paced format.
Can you answer a question for me about frozen water?

My mom and I have found that the water we had in a large plastic pail had frozen and when I had chipped it out with an ice pick the ice was clear everywhere but a small area in the lower-middle where the ice was discoloured and seemed to have contained in it all the impurities and dust particulates in the water.

When I freeze water for ice cubes I notice the same thing happening, but
it was much more visible with the larger volume of water in the pail.
 
My mom was wondering if this is a way to purify water? Would chemicals
also be forced out of the frozen water is the way salt is removed in the Arctic when icebergs form?

What is happening here?

Thanks!

Marco3
What do you think?


 

Offline Vern

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Does freezing purify water?
« Reply #1 on: 25/01/2009 00:40:31 »
I think maybe some of the impurities will be removed, but I wouldn't bet on it, as in producing drinking water from a pond.
 

Offline Chemistry4me

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Does freezing purify water?
« Reply #2 on: 25/01/2009 01:53:21 »
Quote
when you freeze water, the freezing process is a distillation or purification process. When the ice forms, impurities that exist in the water are ejected from the ice while it freezes, so the ice is always purer than the water from which it formed

http://www.arcticclimatemodeling.org/faq_snow_ice.html
 

Offline yor_on

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Does freezing purify water?
« Reply #3 on: 25/01/2009 02:36:05 »
So when in the desert?
SAS someone?

---

I read about using a plastic rifled sheet to get water?
Not that I'm planning to try but?

Would it work.
I've seen figures stating that you would need something amounting to five liters a day?

---

Yes, it's most definitely a wrong question, considering the tread.
What can I say?

Low attendance threshold?
Never mind no matter:)
« Last Edit: 25/01/2009 02:44:16 by yor_on »
 

Offline Chemistry4me

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Does freezing purify water?
« Reply #4 on: 25/01/2009 02:41:00 »
I read about using a plastic rifled sheet to get water?
What is it? ?????????
 

Offline yor_on

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Does freezing purify water?
« Reply #5 on: 25/01/2009 02:52:14 »
Well, you are expected to use it at mornings when condensation will, 'lead' by the rifles, place water at your cans disposal.

Could be a 'urban myth' though :)
But I've always had a weakness (?) for them:)
Ah, urban legends that is.

But yes, I  have to admit to consider the SAS as the elite of the elite.
When it comes to endurance and 'free thinking'.

That doesn't mean that other won't do some things better.
Samoa seems to have a very 'educated' 'special force' if I remember right?

---

I knew that i remembered wrong here:(

What I tried to remember there was not Samoa, although Samoans are well known to be extremly fierce warriors.
It was the Republic of Fiji Military Forces Commandos who for the last fifteen (?) years been the winners of the Forces Spéciales Competion D'Élite Internationale in Albertsville.

-----------

But SAS do have my heart:)

---
maybe I should I call it 'stripes' instead of 'rifles', or 'lines'?
awh, English :)

---------

Btw: condensation will also be purifying.

So?
« Last Edit: 25/01/2009 16:46:38 by yor_on »
 

Offline Chemistry4me

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Does freezing purify water?
« Reply #6 on: 25/01/2009 02:56:00 »
Samoa seems to have a very 'educated' 'special force' if I remember right?
I doubt it! :D:D
What is the motto for the SAS? It has suddenly disappeared from my head ?????????
 

Offline Chemistry4me

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Does freezing purify water?
« Reply #7 on: 25/01/2009 02:58:43 »
---
Should I call it 'stripes' instead of 'rifles', or 'lines'?

So?
Oh! Now I know what you mean! Call it strips :):)
 

Offline yor_on

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Does freezing purify water?
« Reply #8 on: 25/01/2009 03:02:39 »
I would say it's hearts and minds.
Depending:)
 

Offline Chemistry4me

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Does freezing purify water?
« Reply #9 on: 25/01/2009 03:04:15 »
Who Dares Wins, aha! That's the one! Funny motto, don't you think?
 

Offline yor_on

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Does freezing purify water?
« Reply #10 on: 25/01/2009 03:05:51 »
Really?

:)
 

Offline Chemistry4me

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Does freezing purify water?
« Reply #11 on: 25/01/2009 03:08:25 »
Yes! Of course!
 

Offline yor_on

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Does freezing purify water?
« Reply #12 on: 25/01/2009 03:09:49 »
So do you know?

Would it work?
I've seen some other tricks where you dig a hole in the sand.
But i kind of liked the idea of a plastic sheet?
----

Try to goggle on SAS hearts and minds.
And no, I didn't.
 

Offline Chemistry4me

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Does freezing purify water?
« Reply #13 on: 25/01/2009 03:10:48 »
Maybe we should move this conversation to the "Do you have STB syndrome" thread!
I've put my next post there  :)
« Last Edit: 25/01/2009 03:16:48 by Chemistry4me »
 

Offline yor_on

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Does freezing purify water?
« Reply #14 on: 25/01/2009 03:18:50 »
maybe?

Anyway, 'hearts and minds' is what makes SAS into a elite force to my eyes:)
It's a very good idea, and it will work, if 'allowed' and supported.

So much better that cowardly rocket attacks on unsuspecting 'targets'.

That as it do has a 'moral' quality to it, don't you think?
That and sheer 'guts'.


 

Offline Chemistry4me

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Does freezing purify water?
« Reply #15 on: 25/01/2009 03:22:44 »
Post your next one here
 

Offline yor_on

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Does freezing purify water?
« Reply #16 on: 25/01/2009 03:25:25 »
Awh, now I'm having 'two' conversations with you:)
Does that make me a 'schizo'

Or do I just need to get my eyes checked?
 

Offline Chemistry4me

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Does freezing purify water?
« Reply #17 on: 25/01/2009 03:27:59 »
Or do I just need to get my eyes checked?
No, you don't. But I do.
 

Offline yor_on

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Does freezing purify water?
« Reply #18 on: 25/01/2009 03:28:59 »
I think we both do :)
 

Offline yor_on

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Does freezing purify water?
« Reply #19 on: 25/01/2009 03:40:52 »
Btw: thanks for 'strips' Chem.
I'm not joking when stating that English words can be difficult to 'pinpoint'.
 

Offline Chemistry4me

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Does freezing purify water?
« Reply #20 on: 25/01/2009 03:49:18 »
, you're a funny man Mr. yor_on!,
 

Offline yor_on

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Does freezing purify water?
« Reply #21 on: 25/01/2009 03:54:32 »
Chem, it was you who asked.
--

And the real 'motto' is different from 'unit' to unit'.

As I understand it soldiers use it to espy the sheep's from the wolfs:)
Well, sort off.

« Last Edit: 25/01/2009 04:01:45 by yor_on »
 

Offline Chemistry4me

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« Reply #22 on: 25/01/2009 04:08:00 »
Well there was also: Train hard, fight easy . Train easy, fight hard - and die... (without the smiley(man)/deadeys)
 

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Does freezing purify water?
« Reply #23 on: 25/01/2009 13:33:23 »
 

Offline Farrah Day

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Does freezing purify water?
« Reply #24 on: 25/01/2009 14:50:09 »
Going back to the original post for a mo.

As water begins to freeze, it crystalises, becomes lighter than the rest of the water so rises toward the surface. Impurities heavier than the ice will tend to stay in the unfrozen water. This would continue to happen until many of the impurities are left below the ice, at the bottom of your bucket.
 

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Does freezing purify water?
« Reply #24 on: 25/01/2009 14:50:09 »

 

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