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### Topic: What is the chemical difference between light and heavy magnesium carbonate?  (Read 16935 times)

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#### JWP

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##### What is the chemical difference between light and heavy magnesium carbonate?
« on: February 06, 2006, 08:50:52 PM »
What is the chemical difference between light and heavy magnesium carbonate?
« Last Edit: February 06, 2006, 09:21:29 PM by Mitch »

#### Mitch

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##### Re:Magnesium carbonate
« Reply #1 on: February 06, 2006, 09:21:17 PM »
light and heavy being defined as what?
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#### mike

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##### Re: What is the chemical difference between light and heavy magnesium carbonate?
« Reply #2 on: February 07, 2006, 07:20:08 PM »
I didn't think there was a chemical difference. I thought one was just denser (ie a finer grade and therefore more tightly packed) than the other

I could be wrong....
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#### Morphic flip

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##### Re: What is the chemical difference between light and heavy magnesium carbonate?
« Reply #3 on: February 09, 2006, 03:34:00 PM »
its the same with sodium carbonate, bulk densitys are different.
light - normally higher purity as well.

#### asmaaalseedaraa

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##### Re: What is the chemical difference between light and heavy magnesium carbonate?
« Reply #4 on: October 16, 2007, 08:50:19 PM »
What is the chemical difference between light and heavy magnesium carbonate?

the difference is just restracted in chemical structure which the light magnesium carbonate has 3 of H2O in it and 4 of H2O for  a heavy.

#### UnintentionalChaos

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##### Re: What is the chemical difference between light and heavy magnesium carbonate
« Reply #5 on: October 23, 2007, 09:08:34 PM »
I think that this refers to the method of preparation and resulting composition. A soluble magnesium salt added to a cold carbonate solution affords a voluminous product of basic magnesium carbonate (a poorly defined mixture of magnesium carbonate and magnesium hydroxide). A hot or boiling carbonate solution, or preferably a bicarbonate solution, yields much more pure magnesium carbonate as a precipitate which settles rapidly from the solution, hence "heavy." I remember this discussion from somewhere...I wouldn't quote me on this though...