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### Topic: 20 mg%  (Read 10812 times)

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#### light

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##### 20 mg%
« on: August 17, 2004, 12:05:28 AM »
Calcium chloride (MW 110.99)

20 mg%

hello,

can anyone tell me how to make a 20mg% solution of calcium chloride? what makes me confused is the unit mg%. what on earth does it mean?

thanks!

#### Mitch

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##### Re:20 mg%
« Reply #1 on: August 17, 2004, 02:29:37 AM »
by weight?
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#### light

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##### Re:20 mg%
« Reply #2 on: August 17, 2004, 08:23:08 AM »
here is an example i found;

Dinitrophenol (DNP - MW 184.11)

18.4 mg% - Dissolve 18.4 mg of 2,4-dinitrophenol to a final volume of 100 mL with water or buffer.

but what exactly does mg% mean?

#### Demotivator

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##### Re:20 mg%
« Reply #3 on: August 17, 2004, 09:14:31 AM »
It's a term I haven't heard before either, but I deduce that mg% = % by weight x 1000 (thus the term milli). In the DNP example, 18.4 mg = .0184 g.
(.0184g/100g total) x 100 = .0184% ..the actual percent.
.0184% x 1000 mg = 18.4 mg%
« Last Edit: August 17, 2004, 09:17:20 AM by Demotivator »

#### AWK

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##### Re:20 mg%
« Reply #4 on: August 18, 2004, 04:14:42 AM »
mg% - this term is used often in pharmacy and means - number of mg of solute in 100 g of solution.
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#### thallium chick

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##### Re:20 mg%
« Reply #5 on: August 18, 2004, 12:41:21 PM »
doesnt mg mean miligram?

like maybe 20percent of a miligram??? im not a big fan of the metric system

#### Mitch

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##### Re:20 mg%
« Reply #6 on: August 18, 2004, 05:57:18 PM »
doesnt mg mean miligram?

like maybe 20percent of a miligram??? im not a big fan of the metric system

I would trust Awk
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#### jdurg

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##### Re:20 mg%
« Reply #7 on: August 18, 2004, 10:04:14 PM »
mg% = mg/dL.  Trust me on this one.  I work with lab data all the time, so I constantly see this abbreviation used.
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#### AWK

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##### Re:20 mg%
« Reply #8 on: August 20, 2004, 01:04:12 AM »
Yes, mg means miligrams

100 grams and 1 dL for diluted water solution (eg physiological fluids) are apparently the same,
so Jdurg is also right (in fact for liquids a volume is used, but for solids - always mass).

Frankly saing, Light asked for calcium chloride solution, so Jdurg is slightly more right than me.

Mitch,  thank you to my fan.
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« Last Edit: August 20, 2004, 02:25:02 AM by AWK »
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