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Actor123
medicine forum beginner
Joined: 29 Jun 2005
Posts: 9
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 Posted: Tue Jul 18, 2006 2:42 pm Post subject:
help with calculating elemental magnesium?
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Hi there. I recently received an IV of 1 gram of magnesium sulfate and
am trying to determine how much elemental magnesium that gives me.
Numeruous internet sources say that 1 gram of MgSO4 delivers roughly
100mg of elemental magnesium (roughly 10%). The side of my bad of
epsom salt that I use for baths also says the same. But when I try and
do the calculation myself, by adding up the atomic weights of each of
the elements in MgSO4 and dividing the atomic weight of magnesium into
that number, I get roughly 20%, not 10%. What am I doing wrong? |
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Mike Robinson
medicine forum beginner
Joined: 18 Jul 2006
Posts: 2
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| Posted: Tue Jul 18, 2006 3:50 pm Post subject:
Re: help with calculating elemental magnesium?
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On Tue, 18 Jul 2006 07:42:32 -0700, Actor123 wrote:
| Quote: | Hi there. I recently received an IV of 1 gram of magnesium sulfate and
am trying to determine how much elemental magnesium that gives me.
Numeruous internet sources say that 1 gram of MgSO4 delivers roughly
100mg of elemental magnesium (roughly 10%). The side of my bad of
epsom salt that I use for baths also says the same. But when I try and
do the calculation myself, by adding up the atomic weights of each of
the elements in MgSO4 and dividing the atomic weight of magnesium into
that number, I get roughly 20%, not 10%. What am I doing wrong?
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You are confusing anhydrous magnesium sulfate(MgSO4) with magnesium
sulfate heptahydrate (MgSO4.7H2O). Generally "magnesium sulfate" refers
to the heptahydrate when not specified. |
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Actor123
medicine forum beginner
Joined: 29 Jun 2005
Posts: 9
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| Posted: Wed Jul 19, 2006 2:48 pm Post subject:
Re: help with calculating elemental magnesium?
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Mike Robinson wrote:
| Quote: | On Tue, 18 Jul 2006 07:42:32 -0700, Actor123 wrote:
Hi there. I recently received an IV of 1 gram of magnesium sulfate and
am trying to determine how much elemental magnesium that gives me.
Numeruous internet sources say that 1 gram of MgSO4 delivers roughly
100mg of elemental magnesium (roughly 10%). The side of my bad of
epsom salt that I use for baths also says the same. But when I try and
do the calculation myself, by adding up the atomic weights of each of
the elements in MgSO4 and dividing the atomic weight of magnesium into
that number, I get roughly 20%, not 10%. What am I doing wrong?
You are confusing anhydrous magnesium sulfate(MgSO4) with magnesium
sulfate heptahydrate (MgSO4.7H2O). Generally "magnesium sulfate" refers
to the heptahydrate when not specified.
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Ah, I see. Man, I would have never figured it out. Thanks so much.
Does this apply to Magnesium Chloride as well? I have the option of
switching and might try both but I want to try and get the same amount
of elemental. |
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Mike Robinson
medicine forum beginner
Joined: 18 Jul 2006
Posts: 2
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| Posted: Wed Jul 19, 2006 3:21 pm Post subject:
Re: help with calculating elemental magnesium?
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On Wed, 19 Jul 2006 07:48:47 -0700, Actor123 wrote:
| Quote: | Ah, I see. Man, I would have never figured it out. Thanks so much.
Does this apply to Magnesium Chloride as well? I have the option of
switching and might try both but I want to try and get the same amount
of elemental.
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Magnesium chloride is available as anhydrous MgCl2 (26% elemental Mg) and
as the hexahydrate MgCl2.6H2O (12% elemental Mg). Again, the hydrate is
more common. |
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